Question 1

In a symmetric population,the median equals the mode.

Accepted Answer

A) True 
 B)False  True

Question 2

The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m. ).They selected 13 patrons and had them get in line between 2 and 3 p.m.Each was given a stopwatch to record the time they spent in line.The times recorded were as follows (in minutes).
118,124,108,116,99,120,148,118,119,121,45,130,118
What is the 65th percentile?

Accepted Answer

A) 99 
B) 120 
C) 130 
D) 112 
E) 45 
A) 99 
B) 120 
C) 130 
D) 112 
E) 45 B

Question 3

Suppose that a company's annual sales were $3.6 million at the beginning of a three-year period and at the end had increased to $6.1 million.Find the geometric growth rate of sales.

Accepted Answer

.19 Feedback:3.6(1 + R_g)³ = 6.1 (1 + R_g)³ = 1.69 (1 + R_g) = 1.1911 R_g = .1911

Question 4

The average life of Canadian women is 73.75 years,and the standard deviation of women's life expectancy in Canada is 6.5 years.Using Chebyshev's Theorem,determine the minimum percentage of women in Canada whose life expectancy is between 64 and 83.5 years.

Accepted Answer

A) 93.17% 
B) 68.26% 
C) 55.56% 
D) 88.89% 
E) 33.33% 
A) 93.17% 
B) 68.26% 
C) 55.56% 
D) 88.89% 
E) 33.33%

Question 5

The geometric mean is the rate of change that yields better wealth at the end of a set of time periods than the actual returns.

Accepted Answer

A) True 
 B)False

Question 6

In a hearing test,subjects estimate the loudness (in decibels)of a sound,and the results are: 68,67,70,71,68,75,68,62,80,73,68.
What is the mode?

Accepted Answer

A) 70 
B) 75 
C) 68 
D) 71 
E) 80 
A) 70 
B) 75 
C) 68 
D) 71 
E) 80

Question 7

Quality control is an important issue at ACME Company,which manufactures light bulbs.To test the life-hours of their light bulbs,they randomly sampled nine light bulbs and measured how many hours they lasted.
378,361,350,375,200,391,375,368,321
What is the mode?

Accepted Answer

A) 375 
B) 368 
C) 389.9 
D) 200 
E) 346.6 
A) 375 
B) 368 
C) 389.9 
D) 200 
E) 346.6

Question 8

The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m. ).They selected 13 patrons and had them get in line between 2 and 3 p.m.Each was given a stopwatch to record the time they spent in line.The times recorded were as follows (in minutes).
118,124,108,116,99,120,148,118,119,121,45,130,118
What is the 10th percentile?

Accepted Answer

A) 99 
B) 120 
C) 130 
D) 112 
E) 45 
A) 99 
B) 120 
C) 130 
D) 112 
E) 45

Question 9

As a measure of variation,the sample ___________ is easy to understand and compute.It is based on the two extreme values and is therefore a highly unstable measure.

Accepted Answer

A) Range 
B) Standard deviation 
C) Variance 
D) Interquartile range 
E) Coefficient of variation 
A) Range 
B) Standard deviation 
C) Variance 
D) Interquartile range 
E) Coefficient of variation

Question 10

Compute the population variance of these data: 16,18,23,21,17,16,24,23,9,17,11,16,22,10,15,14.

Accepted Answer

A) 21.9 
B) 3.87 
C) 20.5 
D) 17.0 
E) 3.625 
A) 21.9 
B) 3.87 
C) 20.5 
D) 17.0 
E) 3.625

Question 11

The average life of Canadian women is 73.75 years,and the standard deviation of women's life expectancy in Canada is 6.5 years.Based on Chebyshev's inequality,determine the upper and lower bounds on the average life expectancy of Canadian women such that at least 90 percent of the population is included.

Accepted Answer

A) [12.09 135.41] 
B) [8.75 138.75] 
C) [53.20 94.30] 
D) [66.38 81.13] 
E) [67.25 80.25] 
A) [12.09 135.41] 
B) [8.75 138.75] 
C) [53.20 94.30] 
D) [66.38 81.13] 
E) [67.25 80.25]

Question 12

Which percentile describes the third quartile,Q3?

Accepted Answer

A) 25th 
B) 50th 
C) 75th 
D) 100th 
A) 25th 
B) 50th 
C) 75th 
D) 100th

Question 13

The mode is the measurement in a sample or population that occurs most frequently.

Accepted Answer

A) True 
 B)False

Question 14

In a study of the factors that affect success in economics,data were collected for 8 business students.Scores on a calculus placement test are given with economics final exam scores.The data are below:
$\begin{array} { | l | l | } 
\hline \begin{array} { l } 
\text { Calculus } \
\text { Placement Score }
\end{array} & \begin{array} { l } 
\text { Exam Final } \
\text { Score }
\end{array} \
\hline 17 & 73 \
\hline 21 & 66 \
\hline 11 & 64 \
\hline 16 & 61 \
\hline 15 & 70 \
\hline 11 & 71 \
\hline 24 & 90 \
\hline 27 & 68 \
\hline
\end{array}$ 
It can be shown that for these data: $\bar{X}=17.75, \quad \bar{y}=70.38, \quad \sum_{i=1}^{8}\left(x_{i}-\bar{x}\right)^{2}=237.50$ 
 $\sum_{i=1}^{8}\left(y_{i}-\bar{y}\right)^{2}=545.875, \quad \sum_{i=1}^{8}\left(x_{i}-\bar{x}\right)\left(y_{i}-\bar{y}\right)=140.75$ 
Calculate b1.

Accepted Answer

0.593
Feed

Question 15

In an analysis of the relationship between the average weekly temperature in a major city and the per person consumption of ice cream (pints),a least squares line is defined by the equation 5.72 + .004x.Predict the average amount of ice cream consumed when it is 50° outside.

Accepted Answer

5.92 pints

Question 16

The company financial officer was interested in the average cost of PCs that had been purchased in the past six months.She took a random sample of the price of 10 computers,with the following results.
$3,250,$1,127,$2,995,$3,250,$3,445,$3,449,$1,482,$6,120,$3,009,$4,000
What is the third quartile?

Accepted Answer

A) $1,446.50 
B) $2,617.00 
C) $3,415.75 
D) $3,449.00 
E) $4,212.00 
A) $1,446.50 
B) $2,617.00 
C) $3,415.75 
D) $3,449.00 
E) $4,212.00

Question 17

Using Chebyshev's Rule,find the interval that contains at least 93.75 percent of all measurements when the mean = 2.549 and s = 1.828.

Accepted Answer

A) [-2.935,8.033] 
B) [-1.107,6.205] 
C) [-26.699,31.797] 
D) [2.435,2.663] 
E) [-4.763,9.861] 
A) [-2.935,8.033] 
B) [-1.107,6.205] 
C) [-26.699,31.797] 
D) [2.435,2.663] 
E) [-4.763,9.861]

Question 18

Range is a better measure of variation than standard deviation.

Accepted Answer

A) True 
 B)False

Question 19

Find the z-score for an IQ test score of 118 when the mean is 100 and the standard deviation is 15.

Accepted Answer

A) 1.2 
B) 1.0 
C) 18.0 
D) -1.03 
E) -1.2 
A) 1.2 
B) 1.0 
C) 18.0 
D) -1.03 
E) -1.2

Question 20

In a statistics class,10 scores were randomly selected with the following results:
74,73,77,77,71,68,65,77,67,66
What is the IQR?

Accepted Answer

A) 12.00 
B) 5.25 
C) 10 
D) 5.00 
E) 11.00 
A) 12.00 
B) 5.25 
C) 10 
D) 5.00 
E) 11.00

In a symmetric population,the median equals the mode.

Suppose that a company's annual sales were $3.6 million at the beginning of a three-year period and at the end had increased to $6.1 million.Find the geometric growth rate of sales.

The average life of Canadian women is 73.75 years,and the standard deviation of women's life expectancy in Canada is 6.5 years.Using Chebyshev's Theorem,determine the minimum percentage of women in Canada whose life expectancy is between 64 and 83.5 years.

The geometric mean is the rate of change that yields better wealth at the end of a set of time periods than the actual returns.

In a hearing test,subjects estimate the loudness (in decibels)of a sound,and the results are: 68,67,70,71,68,75,68,62,80,73,68. What is the mode?

Quality control is an important issue at ACME Company,which manufactures light bulbs.To test the life-hours of their light bulbs,they randomly sampled nine light bulbs and measured how many hours they lasted. 378,361,350,375,200,391,375,368,321 What is the mode?

As a measure of variation,the sample ___________ is easy to understand and compute.It is based on the two extreme values and is therefore a highly unstable measure.

Compute the population variance of these data: 16,18,23,21,17,16,24,23,9,17,11,16,22,10,15,14.

Which percentile describes the third quartile,Q₃?

The mode is the measurement in a sample or population that occurs most frequently.

In an analysis of the relationship between the average weekly temperature in a major city and the per person consumption of ice cream (pints),a least squares line is defined by the equation 5.72 + .004x.Predict the average amount of ice cream consumed when it is 50° outside.

The company financial officer was interested in the average cost of PCs that had been purchased in the past six months.She took a random sample of the price of 10 computers,with the following results. $3,250,$1,127,$2,995,$3,250,$3,445,$3,449,$1,482,$6,120,$3,009,$4,000 What is the third quartile?

Using Chebyshev's Rule,find the interval that contains at least 93.75 percent of all measurements when the mean = 2.549 and s = 1.828.

Range is a better measure of variation than standard deviation.

Find the z-score for an IQ test score of 118 when the mean is 100 and the standard deviation is 15.

In a statistics class,10 scores were randomly selected with the following results: 74,73,77,77,71,68,65,77,67,66 What is the IQR?

An Introduction to Business Statistics

Descriptive Statistics: Tabular and Graphical Methods

Probability

Discrete Random Variables

Continuous Random Variables

Sampling and Sampling Distributions

Confidence Intervals

Hypothesis Testing

Comparing Two Means and Two Proportions

Filters

Exam 3: Descriptive Statistics: Numerical Methods

In a symmetric population,the median equals the mode.

Suppose that a company's annual sales were $3.6 million at the beginning of a three-year period and at the end had increased to $6.1 million.Find the geometric growth rate of sales.

The average life of Canadian women is 73.75 years,and the standard deviation of women's life expectancy in Canada is 6.5 years.Using Chebyshev's Theorem,determine the minimum percentage of women in Canada whose life expectancy is between 64 and 83.5 years.

The geometric mean is the rate of change that yields better wealth at the end of a set of time periods than the actual returns.

In a hearing test,subjects estimate the loudness (in decibels)of a sound,and the results are: 68,67,70,71,68,75,68,62,80,73,68. What is the mode?

Quality control is an important issue at ACME Company,which manufactures light bulbs.To test the life-hours of their light bulbs,they randomly sampled nine light bulbs and measured how many hours they lasted. 378,361,350,375,200,391,375,368,321 What is the mode?

As a measure of variation,the sample ___________ is easy to understand and compute.It is based on the two extreme values and is therefore a highly unstable measure.

Compute the population variance of these data: 16,18,23,21,17,16,24,23,9,17,11,16,22,10,15,14.

Which percentile describes the third quartile,Q3?

The mode is the measurement in a sample or population that occurs most frequently.

In an analysis of the relationship between the average weekly temperature in a major city and the per person consumption of ice cream (pints),a least squares line is defined by the equation 5.72 + .004x.Predict the average amount of ice cream consumed when it is 50° outside.

The company financial officer was interested in the average cost of PCs that had been purchased in the past six months.She took a random sample of the price of 10 computers,with the following results. $3,250,$1,127,$2,995,$3,250,$3,445,$3,449,$1,482,$6,120,$3,009,$4,000 What is the third quartile?

Using Chebyshev's Rule,find the interval that contains at least 93.75 percent of all measurements when the mean = 2.549 and s = 1.828.

Range is a better measure of variation than standard deviation.

Find the z-score for an IQ test score of 118 when the mean is 100 and the standard deviation is 15.

In a statistics class,10 scores were randomly selected with the following results: 74,73,77,77,71,68,65,77,67,66 What is the IQR?

An Introduction to Business Statistics

Descriptive Statistics: Tabular and Graphical Methods

Probability

Discrete Random Variables

Continuous Random Variables

Sampling and Sampling Distributions

Confidence Intervals

Hypothesis Testing

Comparing Two Means and Two Proportions

Filters

Which percentile describes the third quartile,Q₃?