Question 1

The correlation coefficient ranges between

Accepted Answer

A) 0 and 1 
B) F1F1F1S1F1F1F101 and F1F1F1S1F1F1F101 
C) minus infinity and plus infinity 
D) 1 and 100 
A) 0 and 1 
B) F1F1F1S1F1F1F101 and F1F1F1S1F1F1F101 
C) minus infinity and plus infinity 
D) 1 and 100 B

Question 2

The coefficient of determination is equal to the

Accepted Answer

A) absolute value of the correlation coefficient 
B) squared value of the correlation coefficient 
C) square-root of the correlation coefficient 
D) inverse value of the correlation coefficient 
A) absolute value of the correlation coefficient 
B) squared value of the correlation coefficient 
C) square-root of the correlation coefficient 
D) inverse value of the correlation coefficient B

Question 3

The population variance can never be

Accepted Answer

A) zero 
B) larger than the standard deviation 
C) negative 
D) all of these are correct 
A) zero 
B) larger than the standard deviation 
C) negative 
D) all of these are correct C

Question 4

Compute the weighted mean for the following data.

Accepted Answer

The answer of Compute the weighted mean for the following...

Question 5

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 6

__________ can be used to make statements about the proportion of data values that must be within a specified number of standard deviations of the mean.

Accepted Answer

A) Chebyshev's theorem 
B) The empirical rule 
C) A five-number summary 
D) A box plot 
A) Chebyshev's theorem 
B) The empirical rule 
C) A five-number summary 
D) A box plot

Question 7

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 8

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 9

The descriptive measure of dispersion that is based on the concept of a deviation about the mean is

Accepted Answer

A) the range 
B) the interquartile range 
C) both the range and the interquartile range 
D) the standard deviation 
A) the range 
B) the interquartile range 
C) both the range and the interquartile range 
D) the standard deviation

Question 10

Exhibit 3-4
The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway.
  
-Refer to Exhibit 3-4. The mean is

Accepted Answer

A) 35 
B) 670 
C) 10 
D) 67 
A) 35 
B) 670 
C) 10 
D) 67

Question 11

Exhibit 3-3
Suppose annual salaries for sales associates from a particular store have a bell-shaped distribution with a mean of $32,500 and a standard deviation of $2,500.
-Refer to Exhibit 3-3. The z-score for a sales associate from this store who earns $28,000 is

Accepted Answer

A) 28 
B) 1.8 
C) -1.8 
D) 0.78 
A) 28 
B) 1.8 
C) -1.8 
D) 0.78

Question 12

Excel's __________ function can be used to compute the sample variance.

Accepted Answer

A) MAX 
B) MODE 
C) VAR.S 
D) STDEV 
A) MAX 
B) MODE 
C) VAR.S 
D) STDEV

Question 13

A mean computed in such a way that each data value is given a weight reflecting its importance is referred to as

Accepted Answer

A) an important mean 
B) a trimmed mean 
C) a weighted mean 
D) a heavy mean 
A) an important mean 
B) a trimmed mean 
C) a weighted mean 
D) a heavy mean

Question 14

Exhibit 3-4
The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway.
  
-Refer to Exhibit 3-4. The standard deviation is

Accepted Answer

A) 6.969 
B) 7.071 
C) 48.570 
D) 50.000 
A) 6.969 
B) 7.071 
C) 48.570 
D) 50.000

Question 15

Since the mode is the most frequently occurring data value, it

Accepted Answer

A) can never be larger than the mean 
B) is always larger than the median 
C) is always larger than the mean 
D) None of the other answers are correct. 
A) can never be larger than the mean 
B) is always larger than the median 
C) is always larger than the mean 
D) None of the other answers are correct.

Question 16

A sample of charge accounts at a local drug store revealed the following frequency distribution of unpaid balances.  
A)Determine the mean unpaid balance.
B)Determine the standard deviation.
C)Compute the coefficient of variation.

Accepted Answer

A.71.1
b.2

Question 17

Excel's __________ function can be used to compute the sample covariance.

Accepted Answer

A) MAX 
B) COVARIANCE.S 
C) VAR 
D) CORREL 
A) MAX 
B) COVARIANCE.S 
C) VAR 
D) CORREL

Question 18

Excel's __________ function can be used to compute the sample correlation coefficient.

Accepted Answer

A) MAX 
B) COVAR 
C) VAR 
D) CORREL 
A) MAX 
B) COVAR 
C) VAR 
D) CORREL

Question 19

Del Michaels had a successful morning, or so he thinks, selling 1300 surplus notebook computers over the telephone to three commercial customers. The three customers were not equally skillful at negotiating a low unit price. Customer A bought 600 computers for $1252 each, B bought 300 units at $1310 each, and C bought 400 at $1375 each.
A) What is the average unit price at which Del sold the 1300 computers?
B) Del's manager told Del he expected him to sell, by the end of the day, a total of 2500 surplus computers at an average price of $1312 each. What is the average unit price at which Del must sell the remaining 1200 computers?

Accepted Answer

A. $1303.2

Question 20

The interquartile range is the difference between the

Accepted Answer

A) first and second quartiles 
B) first and third quartiles 
C) second and third quartiles 
D) second and fourth quartiles 
A) first and second quartiles 
B) first and third quartiles 
C) second and third quartiles 
D) second and fourth quartiles

The correlation coefficient ranges between

The coefficient of determination is equal to the

The population variance can never be

Compute the weighted mean for the following data.

A numerical measure of linear association between two variables is the

__________ can be used to make statements about the proportion of data values that must be within a specified number of standard deviations of the mean.

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 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.

The descriptive measure of dispersion that is based on the concept of a deviation about the mean is

Exhibit 3-4 The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway. -Refer to Exhibit 3-4. The mean is

Exhibit 3-3 Suppose annual salaries for sales associates from a particular store have a bell-shaped distribution with a mean of $32,500 and a standard deviation of $2,500. -Refer to Exhibit 3-3. The z-score for a sales associate from this store who earns $28,000 is

Excel's __________ function can be used to compute the sample variance.

A mean computed in such a way that each data value is given a weight reflecting its importance is referred to as

Exhibit 3-4 The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway. -Refer to Exhibit 3-4. The standard deviation is

Since the mode is the most frequently occurring data value, it

A sample of charge accounts at a local drug store revealed the following frequency distribution of unpaid balances. A)Determine the mean unpaid balance. B)Determine the standard deviation. C)Compute the coefficient of variation.

Excel's __________ function can be used to compute the sample covariance.

Excel's __________ function can be used to compute the sample correlation coefficient.

The interquartile range is the difference between the

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

Statistical Methods for Quality Control

Time Series Analysis and Forecastng

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Exam 3: Descriptive Statistics: Numerical Measures

The correlation coefficient ranges between

The coefficient of determination is equal to the

The population variance can never be

Compute the weighted mean for the following data.

A numerical measure of linear association between two variables is the

__________ can be used to make statements about the proportion of data values that must be within a specified number of standard deviations of the mean.

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 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.

The descriptive measure of dispersion that is based on the concept of a deviation about the mean is

Exhibit 3-4 The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway. -Refer to Exhibit 3-4. The mean is

Exhibit 3-3 Suppose annual salaries for sales associates from a particular store have a bell-shaped distribution with a mean of $32,500 and a standard deviation of $2,500. -Refer to Exhibit 3-3. The z-score for a sales associate from this store who earns $28,000 is

Excel's __________ function can be used to compute the sample variance.

A mean computed in such a way that each data value is given a weight reflecting its importance is referred to as

Exhibit 3-4 The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway. -Refer to Exhibit 3-4. The standard deviation is

Since the mode is the most frequently occurring data value, it

A sample of charge accounts at a local drug store revealed the following frequency distribution of unpaid balances. A)Determine the mean unpaid balance. B)Determine the standard deviation. C)Compute the coefficient of variation.

Excel's __________ function can be used to compute the sample covariance.

Excel's __________ function can be used to compute the sample correlation coefficient.

The interquartile range is the difference between the

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

Statistical Methods for Quality Control

Time Series Analysis and Forecastng

Filters