Question 1

If the variance of a data set is correctly computed with the formula using n - 1 in the denominator,which of the following is true?

Accepted Answer

A) the data set is a sample 
B) the data set is a population 
C) the data set could be either a sample or a population 
D) the data set is from a census 
A) the data set is a sample 
B) the data set is a population 
C) the data set could be either a sample or a population 
D) the data set is from a census

Question 2

In computing descriptive statistics from grouped data,

Accepted Answer

A) data values are treated as if they occur at the midpoint of a class 
B) the grouped data result is more accurate than the ungrouped result 
C) the grouped data computations are used only when a population is being analyzed 
D) None of these alternatives is correct. 
A) data values are treated as if they occur at the midpoint of a class 
B) the grouped data result is more accurate than the ungrouped result 
C) the grouped data computations are used only when a population is being analyzed 
D) None of these alternatives is correct.

Question 3

Which of the following is not a measure of dispersion?

Accepted Answer

A) mode 
B) standard deviation 
C) range 
D) interquartile range 
A) mode 
B) standard deviation 
C) range 
D) interquartile range

Question 4

For the following frequency distribution,
   
a.Compute the mean.
b.Compute the standard deviation.(Assume the data represent a population. )

Accepted Answer

The answer of For the following frequency distribution,
  ...

Question 5

The variance of a sample of 169 observations equals 576.The standard deviation of the sample equals

Accepted Answer

A) 13 
B) 24 
C) 576 
D) 28,461 
A) 13 
B) 24 
C) 576 
D) 28,461

Question 6

Exhibit 3-2
A researcher has collected the following sample data
  
-Refer to Exhibit 3-2.The mode is

Accepted Answer

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

Question 7

The coefficient of correlation

Accepted Answer

A) is the same as the coefficient of determination 
B) can be larger than 1 
C) cannot be larger than 1 
D) cannot be negative 
A) is the same as the coefficient of determination 
B) can be larger than 1 
C) cannot be larger than 1 
D) cannot be negative

Question 8

The following data show the yearly salaries of a random sample of Chattanooga residents.
   
For the above sample,determine the following measures (Give your answer in dollars): 
a.The mean yearly salary.
b.The standard deviation.
c.The mode.
d.The median.
e.The 70th percentile

Accepted Answer

a.$74,000
b.$18,423.

Question 9

The yearly incomes of the top highest paying professions in the United States are shown below.
   
For the above sample,determine the following measures (Give your answer in dollars). 
a.The mean yearly salary
b.The standard deviation
c.The median
d.The mode

Accepted Answer

a.$118,000

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 variance 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 11

Which of the following symbols represents the standard deviation of the population?

Accepted Answer

A) $\sigma$2 
B) $\sigma$ 
C) $\mu$ 
D)    
A) $\sigma$2 
B) $\sigma$ 
C) $\mu$ 
D)

Question 12

In a statistics class,the average grade on the final examination was 75 with a standard deviation of 5.Use Chebyshev's theorem to answer the following questions.
a.At least what percentage of the students received grades between 50 and 100?
b.Determine an interval for the grades that will be true for at least 70% of the students.(Hint: First,compute the Z-score. )

Accepted Answer

a.96%
b.75

Question 13

Exhibit 3-3
A researcher has collected the following sample data.The mean of the sample is 5.
  
-Refer to Exhibit 3-3.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 14

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 15

The following frequency distribution shows the GMAT scores of a sample of MBA students.
   
For the above data,compute the mean GMAT score.

Accepted Answer

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

Question 16

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 median is

Accepted Answer

A) 84 
B) 85 
C) 86 
D) 87 
A) 84 
B) 85 
C) 86 
D) 87

If the variance of a data set is correctly computed with the formula using n - 1 in the denominator,which of the following is true?

In computing descriptive statistics from grouped data,

Which of the following is not a measure of dispersion?

For the following frequency distribution, a.Compute the mean. b.Compute the standard deviation.(Assume the data represent a population. )

The variance of a sample of 169 observations equals 576.The standard deviation of the sample equals

Exhibit 3-2 A researcher has collected the following sample data -Refer to Exhibit 3-2.The mode is

The coefficient of correlation

The following data show the yearly salaries of a random sample of Chattanooga residents. For the above sample,determine the following measures (Give your answer in dollars): a.The mean yearly salary. b.The standard deviation. c.The mode. d.The median. e.The 70th percentile

The yearly incomes of the top highest paying professions in the United States are shown below. For the above sample,determine the following measures (Give your answer in dollars). a.The mean yearly salary b.The standard deviation c.The median d.The mode

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 variance is

Which of the following symbols represents the standard deviation of the population?

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

The difference between the largest and the smallest data values is the

The following frequency distribution shows the GMAT scores of a sample of MBA students. For the above data,compute the mean GMAT score.

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 median is

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

Statistical Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Tests of Goodness of Fit and Independence

Analysis of Variance and Experimental Design

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Index Numbers

Forecasting

Nonparametric Methods

Statistical Methods for Quality Control

Decision Analysis

Sample Survey

Filters

Exam 3: Descriptive Statistics: Numerical Measures

If the variance of a data set is correctly computed with the formula using n - 1 in the denominator,which of the following is true?

In computing descriptive statistics from grouped data,

Which of the following is not a measure of dispersion?

For the following frequency distribution, a.Compute the mean. b.Compute the standard deviation.(Assume the data represent a population. )

The variance of a sample of 169 observations equals 576.The standard deviation of the sample equals

Exhibit 3-2 A researcher has collected the following sample data -Refer to Exhibit 3-2.The mode is

The coefficient of correlation

The following data show the yearly salaries of a random sample of Chattanooga residents. For the above sample,determine the following measures (Give your answer in dollars): a.The mean yearly salary. b.The standard deviation. c.The mode. d.The median. e.The 70th percentile

The yearly incomes of the top highest paying professions in the United States are shown below. For the above sample,determine the following measures (Give your answer in dollars). a.The mean yearly salary b.The standard deviation c.The median d.The mode

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 variance is

Which of the following symbols represents the standard deviation of the population?

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

The difference between the largest and the smallest data values is the

The following frequency distribution shows the GMAT scores of a sample of MBA students. For the above data,compute the mean GMAT score.

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 median is

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

Statistical Inference About Means and Proportions With Two Populations

Inferences About Population Variances

Tests of Goodness of Fit and Independence

Analysis of Variance and Experimental Design

Simple Linear Regression

Multiple Regression

Regression Analysis: Model Building

Index Numbers

Forecasting

Nonparametric Methods

Statistical Methods for Quality Control

Decision Analysis

Sample Survey

Filters