统计与概率
数据分析、概率分布、假设检验与统计方法。
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a social security number consists of nine digits in a particular order,…
$\frac{1}{100000}$
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a thief steals an atm card and must randomly guess the correct three - …
$\frac{1}{1000}$
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assume that there is a 11% rate of disk drive failure in a year. a. if …
$0.998669$
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assume that there is a 11% rate of disk drive failure in a year. a. if …
a. $0.9879$ b. $0.9987$
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in an experiment, college students were given either four quarters or a…
\(0.708\)
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in an experiment, college students were given either four quarters or a…
0.378
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in an experiment, college students were given either four quarters or a…
0.622
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based on a poll, 67% of internet users are more careful about personal …
The probability that at least one of them is careful about personal information is $0.988$. B. It is very possible that the result is not valid because the sample may not be repre…
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based on a poll, 67% of internet users are more careful about personal …
$0.988$
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question 10 0.17 pts hans seyles work was important because it showed t…
that positive change is just as stressful as negative change.
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in a certain country, the true probability of a baby being a girl is 0.…
$0.984$
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in a certain country, the true probability of a baby being a boy is 0.5…
$0.958$
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assuming boys and girls are equally likely, find the probability of a c…
$\frac{1}{2}$
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let event a = subject is telling the truth and event b = polygraph test…
C. The probability that the polygraph indicates lying given that the subject is actually telling the truth.
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in a study of helicopter usage and patient survival, among the 57,072 p…
$0.741$
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in a study of helicopter usage and patient survival, among the 47,032 p…
$0.779$
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the principle of redundancy is used when system reliability is improved…
a. $0.181$ b. $0.03276$ c. $0.00593$ d. D. Yes, because total malfunction would not be impossible, but it would be unlikely.
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the principle of redundancy is used when system reliability is improved…
$0.00593$
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the principle of redundancy is used when system reliability is improved…
$0.03276$
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the principle of redundancy is used when system reliability is improved…
0.181
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use the following results from a test for marijuana use, which is provi…
295
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question 3 points 1 what does a \goal\ mean? an aim for the future a co…
A. An aim for the future
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use the data in the following table, which lists drive - thru order acc…
The probability of getting two orders from Restaurant D is $0.0204$. The events are independent because choosing the first order does not affect the probability of the choice of t…
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use the data in the following table, which lists drive - thru order acc…
The probability of getting an order that is not accurate or is from Restaurant C is approximately $0.341$. The events of selecting an order that is not accurate and selecting an o…
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use the data in the following table, which lists drive - thru order acc…
The probability of getting an order from Restaurant C or an order that is not accurate is approximately \(0.341\). The events are not disjoint events.
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use the data in the following table, which lists drive - thru order acc…
The probability of getting an order from Restaurant A or an order that is accurate is approximately $0.907$. The events are not disjoint because it is possible to select an order …
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use the data in the following table, which lists drive - thru order acc…
\(0.907\); The events are not disjoint.
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complete the following statement. p(a or b) indicates ________. choose …
A. the probability that in a single trial, event A occurs, event B occurs, or they both occur.
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fill in the blank. events that are _______ cannot occur at the same tim…
mutually exclusive
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use the following results from a test for marijuana use, which is provi…
0.568
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use the following results from a test for marijuana use, which is provi…
$0.581$
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use the following results from a test for marijuana use, which is provi…
172
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there are 15,958,866 adults in a region. if a polling organization rand…
1. A. The selections are dependent, because the selection is done without replacement. 2. A. Yes, because the sample size is less than 5% of the population.
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there are 15,958,866 adults in a region. if a polling organization rand…
A. The selections are dependent, because the selection is done without replacement.
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read the excerpt from act 3 of a dolls house. mrs. linde looking at her…
The use of letters and secret meetings develops the theme that hiding the truth will eventually lead to hardship.
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read the excerpt from act 3 of a dolls house. krogstad with a searching…
"This unhappy secret must be disclosed; they must have a complete understanding."
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when randomly selecting adults, let m denote the event of randomly sele…
A. The probability of getting a male, given that someone with blue eyes has been selected.
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define the following words and how they relate to the theories below: ·…
**1. Definitions and relations of the needs - related terms to the theories** - **Physiological needs**: These are the most basic needs for survival such as food, water, shelter, …
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question 44 (2 points) listen which correlation coefficient value indic…
A. -.80
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helmer: what sort of an expression is that to use about our marriage? n…
"I was simply transferred from papa's hands into yours." "I had been living here like a poor woman." "I have existed merely to perform tricks for you." "It is your fault that I ha…
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which statement best describes a command economy? buyers and sellers wo…
The government controls all aspects of the production, distribution, and price of goods and services.
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camera shot size: filmmaking term that refers to how much of a subject …
1a. It likely refers to personal growth in self - expression, overcoming communication barriers, and gaining confidence as speaking freely is a form of freedom. 1b. Self - express…
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camera shot size: filmmaking term that refers to how much of a subject …
a. He means personal growth in self - expression, overcoming communication barriers, and gaining confidence. Speaking freely is a form of freedom, and learning to speak is key for…
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when randomly selecting adults, let m denote the event of randomly sele…
What does $P(M|B)$ represent? A. The probability of getting a male, given that someone with blue eyes has been selected. Is $P(M|B)$ the same as $P(B|M)$? A. No, because $P(B|M)$ …
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• projection screen: surface on which projected images are displayed. •…
a. It likely refers to personal growth in self - expression, possibly overcoming communication barriers and gaining confidence. b. Speaking freely is a form of freedom, and learni…
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what are colloquialisms? arbitrary signs that represent particular mean…
C. unique sayings particular to a culture that cannot be interpreted directly
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question 8 which of the following groups has the highest median family …
B. Asian Americans
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among 300 randomly selected drivers in the 20 - 24 age bracket, 13 were…
The probability that a randomly selected person in the 20 - 24 age bracket will be in a car crash this year is approximately $0.043$. Yes No
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among 300 randomly selected drivers in the 20 - 24 age bracket, 13 were…
Yes
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among 300 randomly selected drivers in the 20 - 24 age bracket, 13 were…
$0.043$
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in a test of a sex - selection technique, results consisted of 277 fema…
The probability that a female will be born using this technique is approximately $0.962$. Yes
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in a test of a sex - selection technique, results consisted of 277 fema…
$0.962$
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you are certain to get a number or a face card when selecting cards fro…
1
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you are certain to get 2 kings when selecting 50 cards from a shuffled …
1
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assume that 1400 births are randomly selected and 710 of the births are…
B. The number of girls is neither significantly low nor significantly high.
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assume that 200 births are randomly selected and 193 of the births are …
C. The number of girls is significantly high.
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ten of the 50 digital video recorders (dvrs) in an inventory are known …
$0.2$
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charlie is riding in a bike race that goes through a valley and a nearb…
(a) Checkpoint 5 (b) Checkpoint 4 (c) It is above sea level.
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the following are the ratings of men by women in an experiment involvin…
1.0, 2.75, 3.5, 6.375, 8.0
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too late to apologize: a declaration - by soomo publishing on the lines…
1. Describes colonists' arrival, grievances against British rule, and desire for independence. 2. Signifies that British actions are beyond the point of apology for colonists; sho…
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refer to the accompanying boxplots that are drawn on the same scale. th…
B. It appears that weights of U.S. Army males increased from 1993 to 2018.
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for a data set of the pulse rates for a sample of adult females, the lo…
a. 39.0 b. Approximately 1.64 c. Approximately - 1.64 d. No
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researchers measured the data speeds for a particular smartphone carrie…
a. 61.24 b. 2.80 c. 2.80 d. Yes, the carrier's highest data speed is significant.
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if your score on your next statistics test is converted to a z - score,…
C. The z score of 2.00 is most preferable because it is 2.00 standard deviations above the mean and would correspond to the highest of the five different possible test scores.
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a successful basketball player has a height of 6 feet 11 inches, or 211…
5.17
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fill in the blank. for data sets having a distribution that is approxim…
the Empirical Rule
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fill in the blank. the range rule of thumb roughly estimates the standa…
$\frac{\text{Range}}{4}$
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which measure of variation is most sensitive to extreme values? choose …
Range
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using the accompanying table of data, blood platelet counts of women ha…
The minimum possible platelet count within 3 standard deviations of the mean is \(59.0\). The maximum possible platelet count within 3 standard deviations of the mean is \(451.4\).
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blood pressure: the following table presents systolic blood - pressure …
$17.9$
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using the accompanying table of data, blood platelet counts of women ha…
89
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the blood platelet counts of a group of women have a bell - shaped dist…
a. 95 b. 99.7 (approximate, since 447.7 is a bit more than 3 standard deviations above the mean but very close to covering almost all of the distribution)
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below are the jersey numbers of 11 players randomly selected from a foo…
1024.0
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below are the jersey numbers of 11 players randomly selected from a foo…
Range = 85.0 Variance \(\approx779.7\) Standard Deviation \(\approx27.9\) The range tells us the spread between the highest and lowest jersey numbers. The variance and standard - …
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a random sample of 10 subjects have weights with a standard deviation o…
$116.1847$ kg$^{2}$
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a random sample of 10 subjects have weights with a standard deviation o…
$116.1841$ kg$^{2}$
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listed below are the numbers of hurricanes that occurred in each year i…
The range of the sample data is 19 hurricanes. The variance of the sample data is 37.2 hurricanes$^{2}$. The standard deviation of the sample data is 6.1 hurricanes. C. The measur…
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listed below are the numbers of hurricanes that occurred in each year i…
37.2 hurricanes$^{2}$ The important feature of the data not revealed by any of the measures of variation is the **distribution of the data** (e.g., whether it is symmetric, skewed…
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listed below are the numbers of hurricanes that occurred in each year i…
The range of the sample data is \(19.0\) number of hurricanes. The variance of the sample data is approximately \(29.2\) number of hurricanes\(^2\). The standard deviation of the …
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listed below are prices in dollars for one night at different hotels in…
The range of the sample data is 187 dollars. D. The measures of variation are not very useful because when searching for a room, low prices, location, and good accommodations are …
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listed below are prices in dollars for one night at different hotels in…
4264.1 dollars$^{2}$
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listed below are prices in dollars for one night at different hotels in…
The standard deviation of the sample data is $65.3$ dollars.
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listed below are prices in dollars for one night at different hotels in…
187.0 dollars
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listed below are amounts (in millions of dollars) collected from parkin…
B. The mean and the median for the security company are both lower than the mean and the median for the collections performed by other companies.
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listed below are amounts (in millions of dollars) collected from parkin…
The mean for the security company is $\$1.42$ million and the mean for the other companies is $\$1.96$ million.
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find the mean of the data summarized in the given frequency distributio…
D. The computed mean is not close to the actual mean because the difference between the means is more than 5%.
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find the mean of the data summarized in the given frequency distributio…
A. The computed mean is not close to the actual mean because the difference between the means is more than 5% of the actual mean.
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find the mean of the data summarized in the given frequency distributio…
$51.6$
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waiting times (in minutes) of customers in a bank where all customers e…
A. The times for customers in individual lines are much more varied than the times for customers in a single line.
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read the excerpt from act 2 of a dolls house. nora: quickly he mustnt g…
C. Krogstad tries to blackmail Nora into getting Helmer to keep him at the bank by exposing her forgery.
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read the excerpt from act 2 of a dolls house. nora: going up to helmer …
Nora is going to beg Helmer to let Krogstad keep his job.
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waiting times (in minutes) of customers in a bank where all customers e…
The mean waiting time for customers in a single line is $7.11$ minutes. The median waiting time for customers in a single line is $7.1$ minutes. The mean waiting time for customer…
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read the excerpt from act 2 of a dolls house. nora: that letter is from…
Nora has forged her father's name on the loan she received from Krogstad, and he is threatening to expose her to Helmer.
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the annual profits for a company are given in the following table, wher…
219
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listed below are the annual tuition amounts of the 10 most expensive co…
A. The mode(s) of the data set is (are) \(53909\). E. Nothing meaningful can be concluded from this information except that these are the largest tuitions of colleges in the count…
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the movement of the progress bar may be uneven because questions can be…
having no equal
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the movement of the progress bar may be uneven because questions can be…
B. viewpoint
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who invented the hamburger? many different cultures, towns, and restaur…
"These small changes, made over centuries, contributed to one of the most popular foods in the world: the mighty hamburger."
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listed below are the annual tuition amounts of the 10 most expensive co…
The mean of the data set is $\$53018.60$. The mid - range of the data set is $\$52508$. The median of the data set is $\$53465.50$. The mode of the data set is $\$53909$.
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the number of newly reported crime cases in a county in new york state …
780