Question 1

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 2

Exhibit 3-1
A researcher has collected the following sample data.  
-The sample variance

Accepted Answer

A) is always smaller than the true value of the population variance 
B) is always larger than the true value of the population variance 
C) could be smaller, equal to, or larger than the true value of the population variance 
D) can never be zero 
A) is always smaller than the true value of the population variance 
B) is always larger than the true value of the population variance 
C) could be smaller, equal to, or larger than the true value of the population variance 
D) can never be zero

Question 3

In computing descriptive statistics for grouped data, the ____ are used to approximate the data values in each class.

Accepted Answer

A) class lower limits 
B) class upper limits 
C) class midpoints 
D) class ranges 
A) class lower limits 
B) class upper limits 
C) class midpoints 
D) class ranges

Question 4

The 50th percentile is the

Accepted Answer

A) mode 
B) median 
C) mean 
D) third quartile 
A) mode 
B) median 
C) mean 
D) third quartile

Question 5

An important measure of location for categorical data is the

Accepted Answer

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

Question 6

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

Question 7

Exhibit 3-1
A researcher has collected the following sample data.  
-Refer to Exhibit 3-1. The 75th percentile is

Accepted Answer

A) 6 
B) 7 
C) 8 
D) 9 
A) 6 
B) 7 
C) 8 
D) 9

Question 8

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 9

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 10

Suppose annual salaries for sales associates from a particular store have a mean of $32,500 and a standard deviation of $2,500.
a.Calculate and interpret the z-score for a sales associate who makes $36,000.
b.Use Chebyshev's theorem to calculate the percentage of sales associates with salaries between $26,250 and $38,750.
c.Suppose that the distribution of annual salaries for sales associates at this store is bell-shaped. Use the empirical rule to calculate the percentage of sales associates with salaries between $27,500 and $37,500.
d.Use the empirical rule to determine the percentage of sales associates with salaries less than $27,500.
e.Still suppose that the distribution of annual salaries for sales associates at this store is bell-shaped. A sales associate makes $42,000. Should this salary be considered an outlier? Explain.

Accepted Answer

a.1.4. This sales associate's annual sal

Question 11

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 12

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 13

The mean of a sample is

Accepted Answer

A) always equal to the mean of the population 
B) always smaller than the mean of the population 
C) computed by summing the data values and dividing the sum by (n - 1) 
D) computed by summing all the data values and dividing the sum by the number of items 
A) always equal to the mean of the population 
B) always smaller than the mean of the population 
C) computed by summing the data values and dividing the sum by (n - 1) 
D) computed by summing all the data values and dividing the sum by the number of items

Question 14

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

Accepted Answer

A) MAX 
B) AVERAGE 
C) MEDIAN 
D) MODE 
A) MAX 
B) AVERAGE 
C) MEDIAN 
D) MODE

Question 15

Since the population is always larger than the sample, the value of the sample mean

Accepted Answer

A) is always smaller than the true value of the population mean 
B) is always larger than the true value of the population mean 
C) is always equal to the true value of the population mean 
D) could be larger, equal to, or smaller than the true value of the population mean 
A) is always smaller than the true value of the population mean 
B) is always larger than the true value of the population mean 
C) is always equal to the true value of the population mean 
D) could be larger, equal to, or smaller than the true value of the population mean

Question 16

Exhibit 3-1
A researcher has collected the following sample data.  
-The interquartile range is used as a measure of variability to overcome what difficulty of the range?

Accepted Answer

A) the sum of the range variances is zero 
B) the range is difficult to compute 
C) the range is influenced too much by extreme values 
D) the range is negative 
A) the sum of the range variances is zero 
B) the range is difficult to compute 
C) the range is influenced too much by extreme values 
D) the range is negative

Question 17

Exhibit 3-1
A researcher has collected the following sample data.  
-The difference between the largest and the smallest data values is the

Accepted Answer

A) variance 
B) interquartile range 
C) range 
D) coefficient of variation 
A) variance 
B) interquartile range 
C) range 
D) coefficient of variation

Question 18

Chebyshev's theorem is applicable

Accepted Answer

A) only to large (n > 30) data sets 
B) only to data sets with no outliers 
C) only to bell-shaped data sets 
D) to any data set 
A) only to large (n > 30) data sets 
B) only to data sets with no outliers 
C) only to bell-shaped data sets 
D) to any data set

Question 19

Exhibit 3-1
A researcher has collected the following sample data.  
-Refer to Exhibit 3-1. The mode is

Accepted Answer

A) 5 
B) 6 
C) 7 
D) 8 
A) 5 
B) 6 
C) 7 
D) 8

Question 20

Ron Butler, a custom home builder, is looking over the expenses he incurred for a house he just completed constructing. For the purpose of pricing future construction projects, he would like to know the average wage ($/hour) he paid the workers he employed. Listed below are the categories of worker he employed, along with their respective wage and total hours worked. What is the average wage ($/hour) he paid the workers?

Accepted Answer

The answer of Ron Butler, a custom home builder, is...

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

Exhibit 3-1 A researcher has collected the following sample data. -The sample variance

In computing descriptive statistics for grouped data, the ____ are used to approximate the data values in each class.

The 50th percentile is the

An important measure of location for categorical data is the

The coefficient of determination is equal to the

Exhibit 3-1 A researcher has collected the following sample data. -Refer to Exhibit 3-1. The 75th percentile is

A numerical measure of linear association between two variables is the

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.

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

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

The mean of a sample is

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

Since the population is always larger than the sample, the value of the sample mean

Exhibit 3-1 A researcher has collected the following sample data. -The interquartile range is used as a measure of variability to overcome what difficulty of the range?

Exhibit 3-1 A researcher has collected the following sample data. -The difference between the largest and the smallest data values is the

Chebyshev's theorem is applicable

Exhibit 3-1 A researcher has collected the following sample data. -Refer to Exhibit 3-1. The mode is

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Hypothesis Tests

Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Tests of Goodness of Fit, Independence and Multiple Proportions

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Time Series Analysis and Forecasting

Nonparametric Methods

Statistical Methods for Quality Control

Decision Analysis

Sample Survey

Filters

Exam 3: Descriptive Statistics: Numerical Measures

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

Exhibit 3-1 A researcher has collected the following sample data. -The sample variance

In computing descriptive statistics for grouped data, the ____ are used to approximate the data values in each class.

The 50th percentile is the

An important measure of location for categorical data is the

The coefficient of determination is equal to the

Exhibit 3-1 A researcher has collected the following sample data. -Refer to Exhibit 3-1. The 75th percentile is

A numerical measure of linear association between two variables is the

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.

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

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

The mean of a sample is

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

Since the population is always larger than the sample, the value of the sample mean

Exhibit 3-1 A researcher has collected the following sample data. -The interquartile range is used as a measure of variability to overcome what difficulty of the range?

Exhibit 3-1 A researcher has collected the following sample data. -The difference between the largest and the smallest data values is the

Chebyshev's theorem is applicable

Exhibit 3-1 A researcher has collected the following sample data. -Refer to Exhibit 3-1. The mode is

Data and Statistics

Descriptive Statistics: Tabular and Graphical Displays

Introduction to Probability

Discrete Probability Distributions

Continuous Probability Distributions

Sampling and Sampling Distributions

Interval Estimation

Hypothesis Tests

Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Tests of Goodness of Fit, Independence and Multiple Proportions

Experimental Design and Analysis of Variance

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Time Series Analysis and Forecasting

Nonparametric Methods

Statistical Methods for Quality Control

Decision Analysis

Sample Survey

Filters