Question 1

If two groups of numbers have the same mean, then their

Accepted Answer

A) standard deviations must also be equal 
B) medians must also be equal 
C) modes must also be equal 
D) None of the other answers are correct. 
A) standard deviations must also be equal 
B) medians must also be equal 
C) modes must also be equal 
D) None of the other answers are correct. D

Question 2

Paul, a freshman at a local college just completed 15 credit hours. His grade report is presented below.   The local university uses a 4 point grading system, i.e., A = 4, B = 3, C = 2, D = 1, F = 0. Compute Paul's semester grade point average.

Accepted Answer

2.6

Question 3

The value of the sum of the squared deviations from the mean, i.e.,   must always be

Accepted Answer

A) less than the mean 
B) negative 
C) either positive or negative depending on whether the mean is negative or positive 
D) at least zero 
A) less than the mean 
B) negative 
C) either positive or negative depending on whether the mean is negative or positive 
D) at least zero D

Question 4

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

Accepted Answer

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

Question 5

The measure of central location most often reported for annual income and property value data is the

Accepted Answer

A) median 
B) mode 
C) weighted mean 
D) aggregate mean 
A) median 
B) mode 
C) weighted mean 
D) aggregate mean

Question 6

Which of the following descriptive statistics is not measured in the same units as the data?

Accepted Answer

A) 35th percentile 
B) standard deviation 
C) variance 
D) interquartile range 
A) 35th percentile 
B) standard deviation 
C) variance 
D) interquartile range

Question 7

The amount of time that a sample of students spends watching television per day is given below.   
a.Compute the mean.
b.Compute the median.
c.Compute the standard deviation.
d.Compute the 75th percentile.

Accepted Answer

a.46
b.44

Question 8

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

Accepted Answer

A) MAX 
B) MODE 
C) VAR 
D) None of the other answers are correct. 
A) MAX 
B) MODE 
C) VAR 
D) None of the other answers are correct.

Question 9

Exhibit 3-2
A researcher has collected the following sample data. The mean of the sample is 5.  
-Refer to Exhibit 3-2. The coefficient of variation is

Accepted Answer

A) 72.66% 
B) 81.24% 
C) 264% 
D) 330% 
A) 72.66% 
B) 81.24% 
C) 264% 
D) 330%

Question 10

For the following data   Compute the following measures:
a. The mean
b. The variance
c. The standard deviation
d. The coefficient of variation
e. The 25th percentile
f. The median
g. The 75th percentile

Accepted Answer

a.20
b.5.7

Question 11

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

Accepted Answer

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

Question 12

The sum of deviations of the individual data elements from their mean is

Accepted Answer

A) always greater than zero 
B) always less than zero 
C) sometimes greater than and sometimes less than zero, depending on the data elements 
D) always equal to zero 
A) always greater than zero 
B) always less than zero 
C) sometimes greater than and sometimes less than zero, depending on the data elements 
D) always equal to zero

Question 13

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

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

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 16

Exhibit 3-2
A researcher has collected the following sample data. The mean of the sample is 5.  
-Refer to Exhibit 3-2. The standard deviation is

Accepted Answer

A) 8.944 
B) 4.062 
C) 13.2 
D) 16.5 
A) 8.944 
B) 4.062 
C) 13.2 
D) 16.5

Question 17

A graphical summary of data that is based on a five-number summary is a

Accepted Answer

A) histogram 
B) stem-and-leaf display 
C) scatter diagram 
D) box plot 
A) histogram 
B) stem-and-leaf display 
C) scatter diagram 
D) box plot

Question 18

A numerical measure computed from a sample, such as sample mean, is known as a

Accepted Answer

A) population parameter 
B) sample parameter 
C) sample statistic 
D) population mean 
A) population parameter 
B) sample parameter 
C) sample statistic 
D) population mean

Question 19

Angela Lopez, a golf instructor, is interested in investigating the relationship between a golfer's average driving distance and 18-hole score. She recently observed the performance of six golfers during one round of a tournament and measured, as accurately as possible, the distances (yards) of their drives and noted their final scores. She then computed each golfer's average drive distance for 18 holes. The results of her sample are shown below.   Compute and interpret both the sample covariance and the sample correlation coefficient.

Accepted Answer

The sample covariance value of -7.08 ind

Question 20

The coefficient of variation indicates how large the standard deviation is relative to the

Accepted Answer

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

If two groups of numbers have the same mean, then their

Paul, a freshman at a local college just completed 15 credit hours. His grade report is presented below. The local university uses a 4 point grading system, i.e., A = 4, B = 3, C = 2, D = 1, F = 0. Compute Paul's semester grade point average.

The value of the sum of the squared deviations from the mean, i.e., must always be

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

The measure of central location most often reported for annual income and property value data is the

Which of the following descriptive statistics is not measured in the same units as the data?

The amount of time that a sample of students spends watching television per day is given below. a.Compute the mean. b.Compute the median. c.Compute the standard deviation. d.Compute the 75th percentile.

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

Exhibit 3-2 A researcher has collected the following sample data. The mean of the sample is 5. -Refer to Exhibit 3-2. The coefficient of variation is

For the following data Compute the following measures: a. The mean b. The variance c. The standard deviation d. The coefficient of variation e. The 25th percentile f. The median g. The 75th percentile

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

The sum of deviations of the individual data elements from their mean is

The population variance can never be

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

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

Exhibit 3-2 A researcher has collected the following sample data. The mean of the sample is 5. -Refer to Exhibit 3-2. The standard deviation is

A graphical summary of data that is based on a five-number summary is a

A numerical measure computed from a sample, such as sample mean, is known as a

The coefficient of variation indicates how large the standard deviation is relative to the

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

If two groups of numbers have the same mean, then their

Paul, a freshman at a local college just completed 15 credit hours. His grade report is presented below. The local university uses a 4 point grading system, i.e., A = 4, B = 3, C = 2, D = 1, F = 0. Compute Paul's semester grade point average.

The value of the sum of the squared deviations from the mean, i.e., must always be

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

The measure of central location most often reported for annual income and property value data is the

Which of the following descriptive statistics is not measured in the same units as the data?

The amount of time that a sample of students spends watching television per day is given below. a.Compute the mean. b.Compute the median. c.Compute the standard deviation. d.Compute the 75th percentile.

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

Exhibit 3-2 A researcher has collected the following sample data. The mean of the sample is 5. -Refer to Exhibit 3-2. The coefficient of variation is

For the following data Compute the following measures: a. The mean b. The variance c. The standard deviation d. The coefficient of variation e. The 25th percentile f. The median g. The 75th percentile

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

The sum of deviations of the individual data elements from their mean is

The population variance can never be

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

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

Exhibit 3-2 A researcher has collected the following sample data. The mean of the sample is 5. -Refer to Exhibit 3-2. The standard deviation is

A graphical summary of data that is based on a five-number summary is a

A numerical measure computed from a sample, such as sample mean, is known as a

The coefficient of variation indicates how large the standard deviation is relative to the

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