Question 1

It is appropriate to use the Empirical Rule to describe a population that is extremely skewed.

Accepted Answer

A) True 
 B)False

Question 2

The ______________ is a quantity that measures the variation of a population or sample relative to its mean.

Accepted Answer

A) Mean 
B) Standard deviation 
C) Range 
D) Coefficient of variation 
E) Z-score 
A) Mean 
B) Standard deviation 
C) Range 
D) Coefficient of variation 
E) Z-score

Question 3

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 mean?

Accepted Answer

A) 114.15 
B) 118 
C) 148 
D) 45 
E) 115.5 
A) 114.15 
B) 118 
C) 148 
D) 45 
E) 115.5

Question 4

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)(mean = 114.15):
118,124,108,116,99,120,148,118,119,121,45,130,118
What is the standard deviation?

Accepted Answer

A) 103 
B) 23.62 
C) 557.97 
D) 128.8 
E) 115 
A) 103 
B) 23.62 
C) 557.97 
D) 128.8 
E) 115

Question 5

As the coefficient of variation _______________ risk ______________.

Accepted Answer

A) Increases,Decreases 
B) Decreases,Increases 
C) Increases,Increases 
D) Remains constant,Increases 
A) Increases,Decreases 
B) Decreases,Increases 
C) Increases,Increases 
D) Remains constant,Increases

Question 6

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 median?

Accepted Answer

A) 114.15 
B) 118 
C) 148 
D) 45 
E) 115.5 
A) 114.15 
B) 118 
C) 148 
D) 45 
E) 115.5

Question 7

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 the sample covariance.

Accepted Answer

A) 17.59 
B) 7.93 
C) 2.00 
D) 33.93 
E) 20.11 
A) 17.59 
B) 7.93 
C) 2.00 
D) 33.93 
E) 20.11

Question 8

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 IQR?

Accepted Answer

A) 681 
B) 454 
C) 1362 
D) 255 
E) 6120 
A) 681 
B) 454 
C) 1362 
D) 255 
E) 6120

Question 9

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)(mean = 114.15):
118,124,108,116,99,120,148,118,119,121,45,130,118
What is the range?

Accepted Answer

A) 103 
B) 23.62 
C) 557.97 
D) 128.8 
E) 115 
A) 103 
B) 23.62 
C) 557.97 
D) 128.8 
E) 115

Question 10

According to a survey of the top 10 employers in a major city in the Midwest,a worker spends an average of 413 minutes a day on the job.Suppose the standard deviation is 26.8 minutes,and the time spent is approximately a normal distribution.
What are the times within which approximately 68.26 percent of all workers will fall?

Accepted Answer

A) [394.8,431.2] 
B) [386.2,439.8] 
C) [372.8,453.2] 
D) [359.4,466.6] 
E) [332.6,493.4] 
A) [394.8,431.2] 
B) [386.2,439.8] 
C) [372.8,453.2] 
D) [359.4,466.6] 
E) [332.6,493.4]

Question 11

The median is said to be resistant to extreme values.

Accepted Answer

A) True 
 B)False

Question 12

In a statistics class,10 scores were randomly selected with the following results (mean = 71.5):
74,73,77,77,71,68,65,77,67,66
What is the variance?

Accepted Answer

A) 22.72 
B) 12.00 
C) 4.77 
D) 516.20 
E) 144.00 
A) 22.72 
B) 12.00 
C) 4.77 
D) 516.20 
E) 144.00

Question 13

The weights that are used in calculating a weighted mean will vary depending on the situation.

Accepted Answer

A) True 
 B)False

Question 14

If a population distribution is skewed to the right,then,given a random sample from that population,one would expect that the ____________.

Accepted Answer

A) Median would be greater than the mean 
B) Mode would be equal to the mean 
C) Median would be less than the mean 
D) Median would be equal to the mean 
A) Median would be greater than the mean 
B) Mode would be equal to the mean 
C) Median would be less than the mean 
D) Median would be equal to the mean

Question 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 10th percentile?

Accepted Answer

A) 65.5 
B) 67.3 
C) 66.75 
D) 73.85 
E) 77.0 
A) 65.5 
B) 67.3 
C) 66.75 
D) 73.85 
E) 77.0

Question 16

The population mean is the point estimate of the sample mean.

Accepted Answer

A) True 
 B)False

Question 17

The average of the squared deviations of the individual population measurement from the population mean is the ___________.

Accepted Answer

A) Standard deviation 
B) Mean 
C) Variance 
D) Median 
E) Range 
A) Standard deviation 
B) Mean 
C) Variance 
D) Median 
E) Range

Question 18

A measure of the strength of the linear relationship between x and y that is dependent on the units in which x and y are measured.

Accepted Answer

A) Covariance 
B) Correlation coefficient 
C) Slope 
D) Least squares line 
A) Covariance 
B) Correlation coefficient 
C) Slope 
D) Least squares line

Question 19

Researchers wish to study fuel consumption rates based on speed.The data from 10 cars are below: $\begin{array} { | l | l | } 
\hline \text { Speed } & \text { Miles/Gallon } \
\hline 15 & 14 \
\hline 23 & 17 \
\hline 30 & 20 \
\hline 35 & 24 \
\hline 42 & 26 \
\hline 45 & 23 \
\hline 50 & 18 \
\hline 54 & 15 \
\hline 60 & 11 \
\hline 65 & 10 \
\hline
\end{array}$
It can be shown that for these data: $\bar{X}=41.9, \quad \bar{y}=17.8, \quad \sum_{i=1}^{10}\left(x_{i}-\bar{x}\right)^{2}=2352.9$
$\sum_{i=1}^{10}\left(y_{i}-\bar{y}\right)^{2}=267.6, \quad \sum_{i=1}^{10}\left(x_{i}-\bar{x}\right)\left(y_{i}-\bar{y}\right)=-270.2$
Calculate the sample covariance.

Accepted Answer

A) -270.2 
B) -30.02 
C) -27.02 
D) -74.58 
E) -82.86 
A) -270.2 
B) -30.02 
C) -27.02 
D) -74.58 
E) -82.86

Question 20

All of the following are measures of central tendency except the ____________.

Accepted Answer

A) Range 
B) Mode 
C) Mean 
D) Median 
A) Range 
B) Mode 
C) Mean 
D) Median

It is appropriate to use the Empirical Rule to describe a population that is extremely skewed.

The ______________ is a quantity that measures the variation of a population or sample relative to its mean.

As the coefficient of variation _ risk .

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 IQR?

The median is said to be resistant to extreme values.

In a statistics class,10 scores were randomly selected with the following results (mean = 71.5): 74,73,77,77,71,68,65,77,67,66 What is the variance?

The weights that are used in calculating a weighted mean will vary depending on the situation.

If a population distribution is skewed to the right,then,given a random sample from that population,one would expect that the ____________.

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 10^th percentile?

The population mean is the point estimate of the sample mean.

The average of the squared deviations of the individual population measurement from the population mean is the ___________.

A measure of the strength of the linear relationship between x and y that is dependent on the units in which x and y are measured.

All of the following are measures of central tendency except the ____________.

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

It is appropriate to use the Empirical Rule to describe a population that is extremely skewed.

The ______________ is a quantity that measures the variation of a population or sample relative to its mean.

As the coefficient of variation _______________ risk ______________.

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 IQR?

The median is said to be resistant to extreme values.

In a statistics class,10 scores were randomly selected with the following results (mean = 71.5): 74,73,77,77,71,68,65,77,67,66 What is the variance?

The weights that are used in calculating a weighted mean will vary depending on the situation.

If a population distribution is skewed to the right,then,given a random sample from that population,one would expect that the ____________.

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 10th percentile?

The population mean is the point estimate of the sample mean.

The average of the squared deviations of the individual population measurement from the population mean is the ___________.

A measure of the strength of the linear relationship between x and y that is dependent on the units in which x and y are measured.

All of the following are measures of central tendency except the ____________.

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

As the coefficient of variation _ risk .

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 10^th percentile?