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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5) what changes to your data set would have caused the standard deviati…
Adding data points that are far from the mean of the data - set or increasing the spread of the existing data points (e.g., making the values more spread out from each other) woul…
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consider the following sine regression model $y = 18.614sin(0.521x - 1.…
B. 61.5
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mar 62.4 apr 67.0 may 76.5 jun 83.9 jul 86.8 aug 88.1 sep 79.2 oct 69.9…
b. $y = 20.077\sin(0.500x - 1.959)+67.577$
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4) which data representation would be most useful if someone wanted to …
| Measure | Data Representation | |--|--| | Mean | List of all data values | | Median | Ordered list of data values | | Interquartile Range (IQR) | Box - and - whisker plot |
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your sine regression model for a given problem is y = 0.500 sin(0.222x …
C. $y(95)=0.17$
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a sine curve is periodic. what does this mean? a. the curve goes throug…
A. the curve goes through one cycle and starts over
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plot the data on a scatter plot. produce a sine regression model for th…
d. May not be accurate, information was taken over 2 year period; More information from previous years would help the prediction be more accurate.
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jan 8 new 0 0 jan 15 1st quarter 7 0.5 jan 22 full 13 1 jan 30 last qua…
a. Yes, it shows repeated and periodic behavior.
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the procedure for the passage of legislation in germany is generally wh…
The procedure for the passage of legislation in Germany: It is introduced by the executive, voted on by the Bundestag, and then approved by the Bundesrat. The 5 percent clause mea…
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question 19 1 pts the cabinet is established by the constitution. fixed…
C. comprised of the chief officers of the major executive departments
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10. a sample of musicians was asked to estimate the number of hours spe…
D. mean = 46.3 hours, median = 41.5 hours
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18. as americans, we _____ the great ideals of human freedom expressed …
1. famous 2. antics 3. veered 4. nurtured 5. staunch 6. excess 7. bantered 8. underestimated 9. aspiring 10. venerate 11. masked 12. vindictive 13. roundabout 14. plentiful 15. bu…
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1. in minneapolis, the low temperatures in degrees fahrenheit for nine …
C. Changing the highest temperature from a 12 to a -12 will lower both the mean and the median.
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2. a sample of 250 songs from spotify was analyzed using a special algo…
C. The mean must be 72 since the distribution is skewed to the right.
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5. which one of the following statements is correct? a. the median and …
D. If at least 75% of the observations in a data set have the same value, the IQR must be equal to 0.
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6. a sample of 15 college students was asked to indicate the number of …
D. The 25th percentile is 7.5 because this is the number we get when we order the data and average the values in the 4th and 5th positions.
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10. a sample of musicians was asked to estimate the number of hours spe…
D. mean = 46.3 hours, median = 41.5 hours
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9. in dr. smith’s introductory statistics course, the median final exam…
A. It's possible that no student in the course earned exactly 82 points on the final exam.
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7. a sample of 33 broadway shows was examined. each show was categorize…
C. Less than half of the musicals in the sample have run times above 150 minutes.
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6. a sample of 15 college students was asked to indicate the number of …
D. The 25th percentile is 7.5 because this is the number we get when we order the data and average the values in the 4th and 5th positions.
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6. a sample of 15 college students was asked to indicate the number of …
D. The 25th percentile is 7.5 because this is the number we get when we order the data and average the values in the 4th and 5th positions.
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5. which one of the following statements is correct? a. the median and …
D. If at least 75% of the observations in a data set have the same value, the IQR must be equal to 0.
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assume that the readings on the thermometers are normally distributed w…
The correct graph is the one where the shaded area to the left of a vertical line (right of the mean) under the normal curve is 0.93. The temperature for $P_{93}$ is approximately…
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assume that a randomly selected subject is given a bone density test. t…
A. (The graph with the shaded region to the right of \(z = 0.38\)) 0.3520
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multiple - choice questions each have five possible answers (a, b, c, d…
$\frac{12}{125}$
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the accompanying table describes the random variable x, the numbers of …
a. 0.026 b. 0.027 c. B. Since the probability of getting 4 or more sleepwalkers is the probability of the given or more extreme result, the result from part (b) is the relevant pr…
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find the indicated iq score. the graph to the right depicts iq scores o…
113
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find the area of the shaded region. the graph depicts the standard norm…
0.8264
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assume that a procedure yields a binomial distribution with n = 4 trial…
$0.412$
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the accompanying table describes results from groups of 8 births from 8…
a. $0.019$ b. $0.023$ c. D. Since getting 0 girls is an even lower number of girls than getting 1 girl, the result from part (b) is the relevant probability. d. A. Yes, since the …
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determine whether the following value is a continuous random variable, …
A. It is a discrete random variable.
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assume that hybridization experiments are conducted with peas having th…
The result is significantly low, because 13 peas with green pods is less than 15.1 peas.
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assume that different groups of couples use a particular method of gend…
The result is significantly high, because 19 girls is greater than 16.8 girls. A result of 19 girls would suggest that the method is effective.
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a study was conducted to determine whether there were significant diffe…
prob (at least 10 graduated) $\approx0.7161$ prob (exactly 8 graduated) $\approx0.0470$ yes, it is unusual prob (at most 8 graduated) $\approx0.1100$ no, it is not unusual
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multiple - choice questions each have 5 possible answers, one of which …
$P(WWWWC)=0.0819$ $P(\text{exactly one correct answer}) = 0.4096$
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a website that reviews recent movies lists 4 five - star films (the hig…
| Stars | Frequency | Relative Frequency (%) | Cumulative Frequency | |---|---|---|---| | 5 | 4 | 8.0 | 50 | | 4 | 15 | 30.0 | 46 | | 3 | 14 | 28.0 | 31 | | 2 | 11 | 22.0 | 17 | |…
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we hold these truths to be self - evident, that all men are created equ…
A. Certain rights come from God.
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the accompanying table gives the ages of the presidents of a country (i…
The most common age range of the presidents at inauguration is 50 - 54 years.
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what is the meaning of the word taciturn as used in the passage? use th…
quiet and reserved
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what is the meaning of the word feral as used in the passage? use the a…
C. wild
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what is the meaning of the word puerile as used in the passage? use the…
B. childish
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a certain brand of automobile tire has a mean life - span of 34,000 mil…
The life - span 38800 miles corresponds to a percentile of 98.
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1. what does it mean to represent something in \too flattering colours\?
To depict or describe something in an overly positive and idealized way, not showing its true nature or flaws.
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11. homophones are different in meanings or spellings. * 5 poi true fal…
11. True 12. False 13. True 14. False
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a certain brand of automobile tire has a mean life span of 34,000 miles…
No 2.5
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vocabulary from latin and greek roots many people are troubled by indiv…
1. D. skeptical about both the paranormal and the media's motives in focusing on the paranormal 2. A. The author does not believe in the powers of these people. 3. B. Americans ca…
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in nevada $2 billion is wagered on sports each year, legal under state …
It is a criminal action that qualifies someone for prosecution under the RICO statute.
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you explain to the mother that, whatever her reasons, she cannot simply…
B. The defendant must intentionally commit wrongdoing.
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why is hawala an effective means of transferring terrorist funds? it us…
It produces virtually no paper trail.
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a certain brand of automobile tire has a mean life - span of 34,000 mil…
89
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a certain brand of automobile tire has a mean life span of 34,000 miles…
2.5
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for the life - span of 38,000 miles, z - score is 1.67 (round to the ne…
The life - span of 29200 miles corresponds to a percentile of 11. The life - span of 38800 miles corresponds to a percentile of 95. The life - span of 34000 miles corresponds to a…
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pregunta 4 the article says: its caused by touch. and its usually aimed…
# Breve explicación: La palabra "tender" en este contexto se refiere a algo blando y sensible. "Soft" significa blando en inglés, lo que es similar en significado. "Clean" signifi…
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infringement is an important component of intellectual property fraud. …
C. the reproduction or distribution of work without permission
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question 7 points 2 what is the irony in the name of the title \a modes…
D. All of the choices
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please read the following passage from \a modest proposal\ and continue…
C. burdens on society
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why should a reader be advised to read slowly and methodically? to unde…
To understand the meaning correctly.
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parliament comes from the french word \parlez\ which means what? select…
1. d. To speak 2. b. House of Commons and the House of Lords 3. c. It means it has a two chamber or two house legislature.
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suppose a random variable, x, arises from a binomial experiment. suppos…
0: 0.005654 1: 0.042597 2: 0.137637 3: 0.253570 4: 0.290714 5: 0.206147 6: 0.087393 7: 0.015007
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several archeology students are unprepared for a surprise true/false te…
$\mu = 11.0$ $\sigma\approx2.35$ usual values = $[6,16]$ No, it would not be unusual
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question 12 assume that a procedure yields a binomial distribution with…
$\mu = 1030.7$ $\sigma\approx12.84$ Usual values: $[1005,1056]$
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about 7% of the population has a particular genetic mutation. 400 peopl…
28
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if a seed is planted, it has a 50% chance of growing into a healthy pla…
d) $0.0485$ e) $0.1587$ f) $0.7928$ g) $0.0485$ h) $0.1587$ i) $0.8413$
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if a seed is planted, it has a 50% chance of growing into a healthy pla…
a. The number of the 100 randomly - selected seeds that grow into a healthy plant b. \(n = 100\) c. \(p = 0.5\) d. \(0.0485\) e. \(0.1587\) f. \(0.7928\) g. \(0.0485\) h. \(0.1587…
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describe the shape of the histogram. skewed right roughly symmetric ske…
Describe the shape of the histogram: Skewed right Mean \(\mu = 1.1\) Variance \(\sigma^{2}=1.39\) Standard deviation \(\sigma\approx1.1790\)
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suppose a random variable, x, arises from a binomial experiment. suppos…
|x|P(x)| |---|---| |0|0.464404| |1|0.379399| |2|0.139317| |3|0.025439| |4|0.002730| |5|0.000131| |6|0.000003|
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70% of all americans are home owners. if 44 americans are randomly sele…
a. $0.0697$ b. $0.4779$ c. $0.2061$ d. $0.7850$
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section 6.2 homework score: 4/14 answered: 4/14 progress saved done que…
a. $0.0958$ b. $0.6288$ c. $0.2061$ d. $0.7285$
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section 6.2 homework score: 3/14 answered: 3/14 progress saved done que…
$0.0425$
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achieving closeness through doing is best illustrated by which of the f…
1. C. Going to ball games together 2. C. Ignore criticisms
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question 8 of 10. which of these describes ezra pounds feelings about t…
B. Too many words blur the reader's experience.
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in every bar graph, line graph, or scatter plot, the vertical axis shou…
A. zero
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describe how the graph below is deceptive. mikes grade point average 0 …
b. It appears that Mike's grade point average for the second quarter was significantly larger than his first quarter average. Change the intervals on the vertical scale so they ar…
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in analyzing a line graph, why is slope important? a. the slope should …
B. The slope of the line reflects the actual trend of the data.
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use a normal approximation to find the probability of the indicated num…
\(0.8400\)
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fill in the blank. if a sample size is less than _______, the sample si…
C. 30
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a survey found that womens heights are normally distributed with mean 6…
a. $98.46$ C. No, because only a small percentage of women are not allowed to join this branch of the military because of their height. b. $57.6$ $68.5$
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assume that adults have iq scores that are normally distributed with a …
$0.9641$
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the weights of college football players are normally distributed with a…
C. 0.3812
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find the area of the shaded region. the graph to the right depicts iq s…
$0.6065$
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find the area of the shaded region. the graph to the right depicts iq s…
$0.6293$
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find the indicated z score. the graph depicts the standard normal distr…
$0.97$
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if z is a standard normal variable, find the probability that z lies be…
D. 0.4920
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find the area of the shaded region. the graph depicts the standard norm…
0.6103
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1.2.2 study: understand modern poetry the apparition of these faces in …
The word "apparition" implies unreality and fleetingness of the crowd - experience, reflecting disillusionment.
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study: understand modern poetry the apparition of these faces in the cr…
The word "apparition" gives a sense of unreality to the faces in the crowd, suggesting the speaker's disillusionment with the world and human connections as the faces seem ghost -…
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what requirements are necessary for a normal probability distribution t…
C. The mean and standard deviation have the values of $\mu = 0$ and $\sigma=1$
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determine whether the given procedure results in a binomial distributio…
A. Not binomial: there are more than two outcomes for each trial.
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find the standard deviation, $sigma$, for the binomial distribution whi…
C. $\sigma = 10.28$
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find the mean, $mu$, for the binomial distribution which has the stated…
A. $\mu = 473.2$
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find the standard deviation, $sigma$, for the binomial distribution wit…
C. $\sigma = 3.02$
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according to a college survey, 22% of all students work full time. find…
D. 3.5 students
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assume that a procedure yields a binomial distribution with n = 5 trial…
$0.021$
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identify the given random variable as being discrete or continuous. the…
Continuous
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fill in the blank. a ______ random variable has infinitely many values …
continuous
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fill in the blank. a ______ random variable has either a finite or a co…
discrete
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in a certain college, 33% of the physics majors belong to ethnic minori…
B. 0.981
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if np ≥ 5 and nq ≥ 5, estimate p(more than 7) with n = 11 and p = 0.6 b…
B. The normal distribution cannot be used.
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if np ≥ 5 and nq ≥ 5, estimate p(fewer than 7) with n = 14 and p = 0.6 …
A. \(P(\text{fewer than }7)=0.1492\)
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in a survey of 1327 people, 871 people said they voted in a recent pres…
B. Some people are being less than honest because $P(x\geq871)$ is less than 5%