Question 1

A numerical measure of linear association between two variables is the

Accepted Answer

A) variance 
B) covariance 
C) standard deviation 
D) coefficient of variation 
A) variance 
B) covariance 
C) standard deviation 
D) coefficient of variation

Question 2

Which of the following is not a measure of central location?

Accepted Answer

A) mean 
B) median 
C) variance 
D) mode 
A) mean 
B) median 
C) variance 
D) mode

Question 3

Exhibit 3-3
A researcher has collected the following sample data. The mean of the sample is 5.
  
-Refer to Exhibit 3-3. The variance is

Accepted Answer

A) 80 
B) 4.062 
C) 13.2 
D) 16.5 
A) 80 
B) 4.062 
C) 13.2 
D) 16.5

Question 4

When should measures of location and dispersion be computed from grouped data rather than from individual data values?

Accepted Answer

A) as much as possible since computations are easier 
B) only when individual data values are unavailable 
C) whenever computer packages for descriptive statistics are unavailable 
D) only when the data are from a population 
A) as much as possible since computations are easier 
B) only when individual data values are unavailable 
C) whenever computer packages for descriptive statistics are unavailable 
D) only when the data are from a population

Question 5

The symbol  $\sigma$2 is used to represent

Accepted Answer

A) the variance of the population 
B) the standard deviation of the sample 
C) the standard deviation of the population 
D) the variance of the sample 
A) the variance of the population 
B) the standard deviation of the sample 
C) the standard deviation of the population 
D) the variance of the sample

Question 6

A sample of twelve families was taken. Each family was asked how many times per week they dine in restaurants. Their responses are given below.
   Using this data set, compute the
a. mode
b. median
c. mean
d. range
e. interquartile range
f. variance
g. standard deviation
h. coefficient of variation

Accepted Answer

a.2
b.1.5
c.1.25
d.2

Question 7

The grade point average of the students at UTC is 2.80 with a standard deviation of 0.84. The grade point average of students at UTK is 2.4 with a standard deviation of 0.84. Which university shows a more dispersed grade distribution?

Accepted Answer

UTK's coefficient of variation

Question 8

Exhibit 3-6
The closing stock price of MNM Corporation for the last 7 trading days is shown below.
  
-Refer to Exhibit 3-6. The variance is

Accepted Answer

A) 2.828 
B) 8 
C) 9 
D) 81 
A) 2.828 
B) 8 
C) 9 
D) 81

Question 9

Which of the following symbols represents the variance of the population?

Accepted Answer

A)  $\sigma$2 
B)  $\sigma$ 
C) $\mu$ 
D) $ \overline{\mathrm{x}} $ 
A)  $\sigma$2 
B)  $\sigma$ 
C) $\mu$ 
D) $ \overline{\mathrm{x}} $

Question 10

The last semester grades of Nancy, a freshman at a local college are shown below.
   The local university uses a 4 point grading system, i.e., A = 4, B = 3, C = 2, D = 1, F = 0. Compute Nancy's semester grade point average.

Accepted Answer

The answer of The last semester grades of Nancy, a...

Question 11

The numerical value of the standard deviation can never be

Accepted Answer

A) larger than the variance 
B) zero 
C) negative 
D) smaller than the variance 
A) larger than the variance 
B) zero 
C) negative 
D) smaller than the variance

Question 12

The following is a frequency distribution for the ages of a sample of employees at a local company.
   
a.Determine the average age for the sample.
b.Compute the variance.
c.Compute the standard deviation.
d.Compute the coefficient of variation.

Accepted Answer

a.54.5
b.1

Question 13

If a data set has an even number of observations, the median

Accepted Answer

A) cannot be determined 
B) is the average value of the two middle items 
C) must be equal to the mean 
D) is the average value of the two middle items when all items are arranged in ascending order 
A) cannot be determined 
B) is the average value of the two middle items 
C) must be equal to the mean 
D) is the average value of the two middle items when all items are arranged in ascending order

Question 14

The variance of the sample

Accepted Answer

A) can never be negative 
B) can be negative 
C) cannot be zero 
D) cannot be less than one 
A) can never be negative 
B) can be negative 
C) cannot be zero 
D) cannot be less than one

Question 15

The hourly wages of a sample of 130 system analysts are given below.   The coefficient of variation equals

Accepted Answer

A) 0.30% 
B) 30% 
C) 5.4% 
D) 54% 
A) 0.30% 
B) 30% 
C) 5.4% 
D) 54%

Question 16

The following frequency distribution shows the ACT scores of a sample of students:
   For the above data, compute the following. 
a.The mean
b.The standard deviation

Accepted Answer

The answer of The following frequency distribution shows the ACT...

Question 17

The mean of the sample

Accepted Answer

A) is always smaller than the mean of the population from which the sample was taken 
B) can never be zero 
C) can never be negative 
D) None of these alternatives is correct. 
A) is always smaller than the mean of the population from which the sample was taken 
B) can never be zero 
C) can never be negative 
D) None of these alternatives is correct.

Question 18

Which of the following is a measure of dispersion?

Accepted Answer

A) percentiles 
B) quartiles 
C) interquartile range 
D) all of the above are measures of dispersion 
A) percentiles 
B) quartiles 
C) interquartile range 
D) all of the above are measures of dispersion

Question 19

Exhibit 3-6
The closing stock price of MNM Corporation for the last 7 trading days is shown below.
  
-Refer to Exhibit 3-6. The range is

Accepted Answer

A) 7 
B) 8 
C) 9 
D) 91 
A) 7 
B) 8 
C) 9 
D) 91

Question 20

In 2009, the average donation to the Help Way was $225 with a standard deviation of $45. In 2010, the average donation was $400 with a standard deviation of $60. In which year did the donations show a more dispersed distribution?

Accepted Answer

The coefficient of variation i

A numerical measure of linear association between two variables is the

Which of the following is not a measure of central location?

Exhibit 3-3 A researcher has collected the following sample data. The mean of the sample is 5. -Refer to Exhibit 3-3. The variance is

When should measures of location and dispersion be computed from grouped data rather than from individual data values?

The symbol $\sigma$ ² is used to represent

A sample of twelve families was taken. Each family was asked how many times per week they dine in restaurants. Their responses are given below. Using this data set, compute the a. mode b. median c. mean d. range e. interquartile range f. variance g. standard deviation h. coefficient of variation

The grade point average of the students at UTC is 2.80 with a standard deviation of 0.84. The grade point average of students at UTK is 2.4 with a standard deviation of 0.84. Which university shows a more dispersed grade distribution?

Exhibit 3-6 The closing stock price of MNM Corporation for the last 7 trading days is shown below. -Refer to Exhibit 3-6. The variance is

Which of the following symbols represents the variance of the population?

The last semester grades of Nancy, a freshman at a local college are shown below. The local university uses a 4 point grading system, i.e., A = 4, B = 3, C = 2, D = 1, F = 0. Compute Nancy's semester grade point average.

The numerical value of the standard deviation can never be

The following is a frequency distribution for the ages of a sample of employees at a local company. a.Determine the average age for the sample. b.Compute the variance. c.Compute the standard deviation. d.Compute the coefficient of variation.

If a data set has an even number of observations, the median

The variance of the sample

The hourly wages of a sample of 130 system analysts are given below. The coefficient of variation equals

The following frequency distribution shows the ACT scores of a sample of students: For the above data, compute the following. a.The mean b.The standard deviation

The mean of the sample

Which of the following is a measure of dispersion?

Exhibit 3-6 The closing stock price of MNM Corporation for the last 7 trading days is shown below. -Refer to Exhibit 3-6. The range is

In 2009, the average donation to the Help Way was $225 with a standard deviation of $45. In 2010, the average donation was $400 with a standard deviation of $60. In which year did the donations show a more dispersed distribution?

Data and Statistics

Descriptive Statistics: Tabular and Graphical Presentations

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Hypothesis Tests

Comparisons Involving Means, Experimental Design and Analysis of Variance

Comparisons Involving Proportions and a Test of Independence

Simple Linear Regression

Multiple Regression

Filters

Exam 3: Descriptive Statistics: Numerical Measures

A numerical measure of linear association between two variables is the

Which of the following is not a measure of central location?

Exhibit 3-3 A researcher has collected the following sample data. The mean of the sample is 5. -Refer to Exhibit 3-3. The variance is

When should measures of location and dispersion be computed from grouped data rather than from individual data values?

The symbol σ\sigmaσ 2 is used to represent

A sample of twelve families was taken. Each family was asked how many times per week they dine in restaurants. Their responses are given below. Using this data set, compute the a. mode b. median c. mean d. range e. interquartile range f. variance g. standard deviation h. coefficient of variation

The grade point average of the students at UTC is 2.80 with a standard deviation of 0.84. The grade point average of students at UTK is 2.4 with a standard deviation of 0.84. Which university shows a more dispersed grade distribution?

Exhibit 3-6 The closing stock price of MNM Corporation for the last 7 trading days is shown below. -Refer to Exhibit 3-6. The variance is

Which of the following symbols represents the variance of the population?

The last semester grades of Nancy, a freshman at a local college are shown below. The local university uses a 4 point grading system, i.e., A = 4, B = 3, C = 2, D = 1, F = 0. Compute Nancy's semester grade point average.

The numerical value of the standard deviation can never be

The following is a frequency distribution for the ages of a sample of employees at a local company. a.Determine the average age for the sample. b.Compute the variance. c.Compute the standard deviation. d.Compute the coefficient of variation.

If a data set has an even number of observations, the median

The variance of the sample

The hourly wages of a sample of 130 system analysts are given below. The coefficient of variation equals

The following frequency distribution shows the ACT scores of a sample of students: For the above data, compute the following. a.The mean b.The standard deviation

The mean of the sample

Which of the following is a measure of dispersion?

Exhibit 3-6 The closing stock price of MNM Corporation for the last 7 trading days is shown below. -Refer to Exhibit 3-6. The range is

In 2009, the average donation to the Help Way was $225 with a standard deviation of $45. In 2010, the average donation was $400 with a standard deviation of $60. In which year did the donations show a more dispersed distribution?

Data and Statistics

Descriptive Statistics: Tabular and Graphical Presentations

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Hypothesis Tests

Comparisons Involving Means, Experimental Design and Analysis of Variance

Comparisons Involving Proportions and a Test of Independence

Simple Linear Regression

Multiple Regression

Filters

The symbol $\sigma$ ² is used to represent