Question 1

Which of the following is a measure of relative standing?

Accepted Answer

A)  z-score 
B)  mean 
C)  variance 
D)  pie chart

Question 2

The amount spent on textbooks for the fall term was recorded for a sample of five hundred university students. The mean expenditure was calculated to be $500 and the median expenditure was calculated to be $425. Which of the following interpretations of the mean is correct?

Accepted Answer

A)  The average of the textbook costs sampled was $500 
B)  The most frequently occurring textbook cost in the sample was $500 
C)  50% of the students sampled had textbook costs equal to $500 
D)  50% of the students sampled had textbook costs that were less than $500

Question 3

Many firms use on-the-job training to teach their employees computer programming. Suppose you work in the personnel department of a firm that just finished training a group of its employees to program, and you have been requested to review the performance of one of the trainees on the final test that was given to all trainees. The mean and standard deviation of the test scores are 83 and 3, respectively, and the distribution of scores is mound-shaped and symmetric. If a firm wanted to give the best 2.5% of the trainees a big promotion, what test score would be used to identify the trainees in question?

Accepted Answer

The answer of Many firms use on-the-job training to teach...

Question 4

The amount of television viewed by today's youth is of primary concern to Parents Against Watching Television (PAWT). 300 parents of elementary school-aged children were asked to estimate the number of hours per week that their child watches television. The mean and the standard deviation for their responses were 18 and 5, respectively. PAWT constructed a stem-and-leaf display for the data that showed that the distribution of times was a symmetric, mound-shaped distribution. Give an interval where you believe approximately 95% of the television viewing times fell in the distribution.

Accepted Answer

A)  between 8 and 28 hours per week 
B)  less than 13 and more than 23 hours per week 
C)  between 3 and 33 hours per week 
D)  less than 28

Question 5

Which of the following is a measure of the variability of a distribution?

Accepted Answer

A)  range 
B)  skewness 
C)  median 
D)  sample size

Question 6

For a given data set, the lower quartile is 45, the median is 50, and the upper quartile is 57. The minimum value in the data set is 32, and the maximum is 81. a. Find the interquartile range. b. Find the inner fences. c. Find the outer fences. d. Is either of the minimum or maximum values considered an outlier? Explain.

Accepted Answer

The answer of For a given data set, the lower...

Question 7

For a given data set, which is typically greater, the range or the standard deviation?

Accepted Answer

The answer of For a given data set, which is...

Question 8

Fill in the blank. One advantage of the __________ is that the actual data values are retained in the graphical summarization of the data.

Accepted Answer

A)  stem-and-leaf plot 
B)  histogram 
C)  pie chart 2.3 Summation Notation
1 Use Summation Notation

Question 9

A histogram can be constructed using either class frequencies or class relative frequencies as the heights of the bars.

Accepted Answer

A) True 
 B)False

Question 10

The output below displays the mean and median for the state high school dropout rates in year 1 and in year 5. $$\begin{array} { l r r } 
& \text { Year 1 } & \text { Year 5 } \
\text { N } & 51 & 51 \
\text { MEAN } & 28.26 & 26.26 \
\text { MEDIAN } & 27.41 & 25.28
\end{array}$$ Interpret the year 5 median dropout rate of 25.28.

Accepted Answer

A)  Half of the 51 states had a dropout rate below 25.28%. 
B)  Most of the 51 states had a dropout rate close to 25.28%. 
C)  The most frequently observed dropout rate of the 51 states was 25.28%. 
D)  Half of the 51 states had a dropout rate of 25.28%.

Question 11

A study was designed to investigate the effects of two variables - (1) a student's level of mathematical anxiety and (2) teaching method - on a student's achievement in a mathematics course. Students who had a low level of mathematical anxiety were taught using the traditional expository method. These students obtained a mean score of 380 and a standard deviation of 50 on a standardized test. Find and interpret the z-score of a student who scored 450 on the standardized test.

Accepted Answer

The answer of A study was designed to investigate the...

Question 12

The following data represent the scores of 50 students on a statistics exam. $$\begin{array} { l l l l l l l l l l } 
39 & 51 & 59 & 63 & 66 & 68 & 68 & 69 & 70 & 71 \
71 & 71 & 73 & 74 & 76 & 76 & 76 & 77 & 78 & 79 \
79 & 79 & 79 & 80 & 80 & 82 & 83 & 83 & 83 & 85 \
85 & 86 & 86 & 88 & 88 & 88 & 88 & 89 & 89 & 89 \
90 & 90 & 91 & 91 & 92 & 95 & 96 & 97 & 97 & 98
\end{array}$$ a. Find the lower quartile, the upper quartile, and the median of the scores. b. Find the interquartile range of the data and use it to identify potential outliers. c. In a box plot for the data, which scores, if any, would be outside the outer fences? Which scores, if any, would be outside the inner fences but inside the outer fences?

Accepted Answer

The answer of The following data represent the scores of...

Question 13

A data set contains the observations 8, 1, 6, 7, 2. Find $\left( \sum { x } \right) ^ { 2 }$

Accepted Answer

A)  576 
B)  154 
C)  48 
D)  24

Question 14

The calculator screens summarize a data set.  a. Identify the lower and upper quartiles of the data set. b. Find the interquartile range. c. Is there reason to suspect that the data may contain an outlier? Explain.

Accepted Answer

The answer of The calculator screens summarize a data set....

Question 15

The z-score uses the quartiles to identify outliers in a data set.

Accepted Answer

A) True 
 B)False

Question 16

A sociologist recently conducted a survey of citizens over 60 years of age who have net worths too high to qualify for Medicaid but have no private health insurance. The ages of the 25 uninsured senior citizens were as follows: $$\begin{array} { l l l l l l l l l l l l l } 
68 & 73 & 66 & 76 & 86 & 74 & 61 & 89 & 65 & 90 & 69 & 92 & 76 \
62 & 81 & 63 & 68 & 81 & 70 & 73 & 60 & 87 & 75 & 64 & 82 &
\end{array}$$ Suppose the mean and standard deviation are 74.04 and 9.75, respectively. If we assume that the distribution of ages is mound-shaped and symmetric, what percentage of the respondents will be between 64.29 and 93.54 years old?

Accepted Answer

A)  approximately 81.5% 
B)  approximately 68% 
C)  approximately 95% 
D)  approximately 84%

Question 17

In practice, the population mean μ is used to estimate the sample mean x.

Accepted Answer

A) True 
 B)False

Question 18

Each year advertisers spend billions of dollars purchasing commercial time on network television. In the first 6 months of one year, advertisers spent $1.1 billion. Who were the largest spenders? In a recent article, the top 10 leading spenders and how much each spent (in million of dollars) were listed: $$\begin{array} { l r l r } 
\text { Company A } & \$ 71.4 & \text { Company F } & \$ 27.1 \
\text { Company B } & 60.1 & \text { Company G } & 25.1 \
\text { Company C } & 56.5 & \text { Company H } & 23.1 \
\text { Company D } & 55 & \text { Company I } & 22.9 \
\text { Company E } & 28.6 & \text { Company J } & 20.6
\end{array}$$ Calculate the sample variance.

Accepted Answer

A)  372.307 
B)  3759.244 
C)  2070.113 
D)  1854.860

Question 19

A study was designed to investigate the effects of two variables - (1) a student's level of mathematical anxiety and (2) teaching method - on a student's achievement in a mathematics course. Students who had a low level of mathematical anxiety were taught using the traditional expository method. These students obtained a mean score of 370 with a standard deviation of 20 on a standardized test. Assuming no information concerning the shape of the distribution is known, what percentage of the students scored between 330 and 410?

Accepted Answer

A)  at least 75% 
B)  approximately 95% 
C)  at least 89% 
D)  approximately 68%

Question 20

Explain how it can be misleading to report only the mean of a distribution without any measure of the variability.

Accepted Answer

The answer of Explain how it can be misleading to...

Exam 2: Methods for Describing Sets of Data

Which of the following is a measure of relative standing?

The amount spent on textbooks for the fall term was recorded for a sample of five hundred university students. The mean expenditure was calculated to be $500 and the median expenditure was calculated to be $425. Which of the following interpretations of the mean is correct?

Which of the following is a measure of the variability of a distribution?

For a given data set, which is typically greater, the range or the standard deviation?

Fill in the blank. One advantage of the __________ is that the actual data values are retained in the graphical summarization of the data.

A histogram can be constructed using either class frequencies or class relative frequencies as the heights of the bars.

A data set contains the observations 8, 1, 6, 7, 2. Find (∑x) 2\left( \sum { x } \right) ^ { 2 }(∑x) 2

The calculator screens summarize a data set. a. Identify the lower and upper quartiles of the data set. b. Find the interquartile range. c. Is there reason to suspect that the data may contain an outlier? Explain.

The z-score uses the quartiles to identify outliers in a data set.

In practice, the population mean μ is used to estimate the sample mean x.

Explain how it can be misleading to report only the mean of a distribution without any measure of the variability.

A data set contains the observations 8, 1, 6, 7, 2. Find $\left( \sum { x } \right) ^ { 2 }$