Statistiques
Analyse de données, distributions de probabilités et tests d'hypothèses.
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one cable company claims that it has excellent customer service. in fac…
We fail to reject the null hypothesis and conclude that there is insufficient evidence at a 0.01 level of significance that it takes over 45 minutes for the cable technician to ar…
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one cable company claims that it has excellent customer service. in fac…
$1.908$
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one cable company claims that it has excellent customer service. in fac…
$H_a:\mu > 45$
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a pizza delivery chain advertises that it will deliver your pizza in 30…
We fail to reject the null hypothesis and conclude that there is insufficient evidence at a 0.05 level of significance that the mean delivery time is actually more than 30 minutes.
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a pizza delivery chain advertises that it will deliver your pizza in 30…
$1.393$
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the dodge reports are used by many companies in the construction field …
We fail to reject the null hypothesis and conclude that there is insufficient evidence at a 0.01 level of significance to support the claim that the average time required to insta…
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the dodge reports are used by many companies in the construction field …
$-1.996$
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16. choose the best answer. domesticated means ____ tamed and kept for …
A. tamed and kept for use by humans
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a group of local businessmen is thinking about developing land into a s…
>
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it currently takes users a mean of 44 minutes to install the most popul…
We reject the null hypothesis and conclude that there is sufficient evidence at a 0.10 level of significance that the new mean installation time is different from 44 minutes and t…
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it currently takes users a mean of 44 minutes to install the most popul…
$2.660$
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it currently takes users a mean of 44 minutes to install the most popul…
$ eq$
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question 7 of 8, step 1 of 3 17/24 correct in preparation for upcoming …
\( eq\)
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the board of a major credit card company requires that the mean wait ti…
We reject the null hypothesis and conclude that there is sufficient evidence at a 98 % level of confidence to support the claim that the mean wait time is longer than 3.50 minutes.
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the board of a major credit card company requires that the mean wait ti…
$2.45$
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question 6 of 8, step 1 of 3 correct the board of a major credit card c…
$H_0:\mu = 3.50$, $H_a:\mu>3.50$
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hurricane andrew swept through southern florida causing billions of dol…
$2.16$
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describing restrictive and nonrestrictive clauses. sort each characteri…
Restrictive: needed to maintain meaning, not set apart by punctuation, essential to the sentence Non - restrictive: not needed to maintain meaning, set apart by punctuation, not e…
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hurricane andrew swept through southern florida causing billions of dol…
$H_a:\mu > 24500$
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does the frequency distribution appear to have a normal distribution? e…
B. Yes, because the frequencies start low, proceed to one or two high frequencies, then decrease to a low frequency, and the distribution is approximately symmetric.
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fill in the blank. in a ______ distribution, the frequency of a class i…
relative frequency
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construct one table that includes relative frequencies based on the fre…
A. Yes, because the relative frequency of the higher tar classes is greater for nonfiltered cigarettes.
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a manufacturer must test that his bolts are 4.00 cm long when they come…
We fail to reject the null hypothesis and conclude that there is insufficient evidence at a 0.02 level of significance that the mean length of the bolts is different from 4.00 cm …
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a manufacturer must test that his bolts are 4.00 cm long when they come…
$2.02$
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a manufacturer must test that his bolts are 4.00 cm long when they come…
$ eq$
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a national online business magazine reports that the average cost of a …
We fail to reject the null hypothesis and conclude that there is insufficient evidence at a 0.02 level of significance to support the claim that the average cost of a speeding tic…
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a national online business magazine reports that the average cost of a …
$0.71$
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question 10 points 1 which leader advocated for african americans to pu…
C. Booker T. Washington
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construct one table that includes relative frequencies based on the fre…
We cannot complete the relative - frequency table without the actual frequency values. However, for the multiple - choice question about the effectiveness of filters: A. Yes, beca…
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choose the correct histogram below. does the histogram appear to depict…
C. The histogram appears to depict a normal distribution. The frequencies generally increase to a maximum and then decrease, and the histogram is roughly symmetric.
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government regulations restrict the amount of pollutants that can be re…
We reject the null hypothesis and conclude that there is sufficient evidence at a 0.05 level of significance to support the claim that the average pollutants produced by REM Indus…
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read the passage from marriage is a private affair by chinua achebe. in…
A. A historical perspective would focus on arranged marriage being part of the culture at the time the story is set. A feminist perspective would focus on how arranged marriages t…
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government regulations restrict the amount of pollutants that can be re…
$-2.45$
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read the passage from marriage in a private affair by chinua achebe. \f…
Men make decisions, and women accept those decisions.
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read the passage from marriage is a private affair by chinua achebe. on…
Fathers and sons are beginning to have different ideas about what marriage is.
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the iq scores of 50 students are given below. 112 97 106 98 102 90 107 …
| Class | Frequency | | ---- | ---- | | 85 - 89 | 5 | | 90 - 94 | 8 | | 95 - 99 | 9 | | 100 - 104 | 12 | | 105 - 109 | 10 | | 110 - 114 | 7 | | 115 - 119 | 4 |
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the table below shows the frequency distribution of the weights (in gra…
C. The histogram appears to depict a normal distribution. The frequencies generally increase to a maximum and then decrease, and the histogram is roughly symmetric.
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the mayor of a town believes that 67% of the residents favor annexation…
There is sufficient evidence at the 0.10 level of significance to say that the percentage of residents who support the annexation is not 67 %.
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an automobile manufacturer claims that their van has a 46.9 miles/gallo…
$H_0:\mu = 46.9$ $H_a:\mu>46.9$
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question 7 0/2 pts 3 5 details during one shift, the express lane clerk…
4
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an engineer has designed a valve that will regulate water pressure on a…
$H_0:\mu = 7.3$ $H_a:\mu<7.3$
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a sample of 1300 computer chips revealed that 39% of the chips fail in …
$H_0:p\geq0.42$ $H_a:p < 0.42$
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an automobile manufacturer claims that their jeep has a 40.4 miles/gall…
$H_0:\mu = 40.4$ $H_a:\mu<40.4$
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a manufacturer of potato chips would like to know whether its bag filli…
There is sufficient evidence at the 0.02 level of significance that the machine is overfilling the bags.
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the mayor of a town believes that more than 46% of the residents favor …
$H_0:p\leq0.46$ $H_a:p > 0.46$
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the mayor of a town believes that under 28% of the residents favor cons…
There is sufficient evidence at the 0.10 level of significance that the percentage of residents who support the construction is under 28 %.
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identify the lower class limits, upper class limits, class width, class…
Class width: $1$ Class mid - points: $20.5,22.5,24.5,26.5,28.5,30.5,32.5$ Class boundaries: $19.5,21.5,23.5,25.5,27.5,29.5,31.5,33.5$ Number of individuals: $88$
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an engineer has designed a valve that will regulate water pressure on a…
$H_0:\mu = 5.6$ $H_a:\mu>5.6$
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an automobile manufacturer claims that their van has a 51.8 miles/gallo…
$H_0:\mu = 51.8$ $H_a:\mu eq51.8$
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a manufacturer of chocolate chips would like to know whether its bag fi…
$H_0:\mu = 405$ $H_a:\mu<405$
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the mayor of a town believes that under 56% of the residents favor anne…
$H_0:p\geq0.56$ $H_a:p < 0.56$
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the mayor of a town believes that under 36% of the residents favor cons…
There is not sufficient evidence at the 0.05 level of significance that the percentage of residents who support the construction is under 36 %.
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a sample of 1300 computer chips revealed that 51% of the chips do not f…
$H_0:p = 0.54$ $H_a:p eq0.54$
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6. which context clue helps you understand the meaning of batter in the…
C. baked into a cake
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four - handed piano which line from the story best supports a theme tha…
"Her clean, simple performance of “Für Elise” had let me hear a well - worn selection as if it were a new piece of music."
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a hospital director believes that 74% of the lab reports contain errors…
$H_0:p = 0.74$ $H_a:p eq0.74$
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a sample of 1500 computer chips revealed that 41% of the chips fall in …
$H_0:p\geq0.44$ $H_a:p < 0.44$
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the mayor of a town believes that over 27% of the residents favor const…
There is sufficient evidence at the 0.02 level of significance that the percentage of residents who support the construction is over 27 %.
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analyzing a passage from a feminist perspective \i cant - we must - i m…
Men hold power over women. Women are not treated as equal. Women's roles are defined by men.
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a manufacturer of chocolate chips would like to know whether its bag fi…
$H_0:\mu = 412$ $H_a:\mu>412$
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inspectors for a hospital chain with multiple locations randomly select…
C. Cluster random sample
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a researcher polls people as they walk by on the street. what type of s…
E. None of the above
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a tv show host asks his viewers to visit his website and respond to an …
E. None of the above
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a large bakery mass produces cakes on an assembly line. each shift, a q…
D. Systematic random sample
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the mayor of a town believes that less than 57% of the residents favor …
$H_0:p\geq0.57$ $H_a:p < 0.57$
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each law firm in one state registers its phone number with the state co…
A. Simple random sample
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using traditional methods it takes 98 hours to receive an advanced driv…
There is not sufficient evidence at the 0.02 level of significance that the new technique reduces training time.
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a school chooses 3 randomly selected athletes from each of its sports t…
B. Stratified random sample
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in passage 2, how does the underlined paragraph on pages 2 - 3 contribu…
It establishes a contrast between travelling on land and travelling on the sea.
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construct one table that includes relative frequencies based on the fre…
A. Yes, because the relative frequency of the higher tar classes is greater for nonfiltered cigarettes.
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a principal orders t - shirts and wants to check some of them to make s…
C. Cluster random sample
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fill in the blank. class width is found by ______. choose the correct a…
B. subtracting a lower class limit from the next consecutive lower class limit
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an automobile manufacturer claims that their van has a 36.5 miles/gallo…
$H_0:\mu = 36.5$ $H_a:\mu>36.5$
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question 6 of 20, step 1 of 1 4/29 correct a manufacturer of chocolate …
There is not sufficient evidence at the 0.05 level of significance that the machine is underfilling the bags.
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a manufacturer of chocolate chips would like to know whether its bag fi…
There is sufficient evidence at the 0.05 level of significance that the machine is overfilling the bags.
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a manufacturer of banana chips would like to know whether its bag filli…
$H_0:\mu = 438$ $H_a:\mu<438$
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the mayor of a town believes that above 72% of the residents favor anne…
$H_0: p\leq0.72$ $H_a: p > 0.72$
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question 2 of 20, step 1 of 1. the mayor of a town believes that over 3…
There is not sufficient evidence at the 0.10 level of significance that the percentage of residents who support the annexation is over 37 %.
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read the selection and choose the best answer to each question. zoo by …
To hold in one's arms
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an automobile manufacturer claims that their van has a 52.5 miles/gallo…
$H_0:\mu = 52.5$ $H_a:\mu eq52.5$
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mr. thompson runs his own printing and bookbinding business. he suspect…
D. 23, 24, 39, 58, 32
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willy runs a small company with 10 employees. he decides to pick a simp…
D. 6, 7, 1
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the given data represents a frequency distribution of the f - scale int…
Construct a frequency polygon: To construct the frequency polygon, we plot the points \((0,24)\), \((1,16)\), \((2,2)\), \((3,3)\), \((4,1)\) and connect them with straight lines.…
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multiple select question select all that apply which of the following m…
It is based on race, disability status, religion, sexual orientation, or political or moral views. It involves calling people derogatory names, intimidating them, and advocating v…
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which sampling method divides the population up into sections, randomly…
A. Cluster
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there are 90 students in a lunch period, and 5 of them will be selected…
C. 20, 09, 01, 54, 47
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state whether the data described below are discrete or continuous, and …
C. The data are discrete because the data can only take on specific values.
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there are 90 students in a lunch period, and 5 of them will be selected…
A. 06, 57, 29, 54, 10
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state whether the data described below are discrete or continuous, and …
D. The data are discrete because the data can only take on specific values.
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determine whether the data described below are qualitative or quantitat…
C. The data are quantitative because they consist of counts or measurements.
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determine whether the underlined number is a statistic or a parameter. …
Parameter because the value is a numerical measurement describing a characteristic of a population.
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the sinking of the titanic on april 15, 1912, is one of the most infamo…
A. The value is a parameter because it describes some characteristic of a population.
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shifty trends find the correlation coefficient for the given data. roun…
$-0.96$
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write the expression. then, complete the statements. twice the differen…
The word "twice" means $2\times$. The words "the difference of" indicate subtraction. The expression is written as $2(n - 7)$.
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shifty trends find the correlation coefficient for the given data. roun…
$-0.97$
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instrucciones: estudia la información y el diagrama de caja, lee cada p…
50. B. 2 51. B. 2
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the accompanying data represent womens median earnings as a percentage …
C. There is a general upward trend though there have been some down years. An upward trend would be helpful to women so that their earnings become equal to those of men.
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2. local authorities found that as the number of stop signs in a neighb…
c. The variables seem to represent causation.
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the given data represents a frequency distribution of the f - scale int…
A. The distribution appears to be skewed to the right (or positively skewed).
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the given data represents a frequency distribution of the f - scale int…
The distribution is right - skewed. To answer the multiple - choice part about the frequency polygon, we need to visually check which graph has points \((-1,0)\), \((0,25)\), \((1…