Question 1

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 2

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 3

The variance can never be

Accepted Answer

A) zero 
B) larger than the standard deviation 
C) negative 
D) smaller than the standard deviation 
A) zero 
B) larger than the standard deviation 
C) negative 
D) smaller than the standard deviation

Question 4

From a population of size 400, a random sample of 40 items is selected. The median of the sample

Accepted Answer

A) must be 200, since 400 divided by 2 is 200 
B) must be 10, since 400 divided by 400 is 10 
C) must be equal to the median of population, if the sample is truly random 
D) None of these alternatives is correct. 
A) must be 200, since 400 divided by 2 is 200 
B) must be 10, since 400 divided by 400 is 10 
C) must be equal to the median of population, if the sample is truly random 
D) None of these alternatives is correct.

Question 5

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 6

When data are positively skewed, the mean will usually be

Accepted Answer

A) greater than the median 
B) smaller than the median 
C) equal to the median 
D) positive 
A) greater than the median 
B) smaller than the median 
C) equal to the median 
D) positive

Question 7

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 mode is

Accepted Answer

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

Question 8

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 9

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

Accepted Answer

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

Question 10

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 11

When the data are skewed to the right, the measure of Skewness will be

Accepted Answer

A) negative 
B) zero 
C) positive 
D) one 
A) negative 
B) zero 
C) positive 
D) one

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 these alternatives is 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 these alternatives is correct.

Question 13

The standard deviation of a sample was reported to be 7. The report indicated that   = 980. What has been the sample size?

Accepted Answer

The answer of The standard deviation of a sample was...

Question 14

The most important statistical descriptive measure of the location of a data set is the

Accepted Answer

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

Question 15

The following is a frequency distribution of grades of a sample of statistics examinations.   Compute the following measures: 
a.The mean
b.The variance
c.The standard deviation
d.The coefficient of variation

Accepted Answer

a.75
b.130

Question 16

Exhibit 3-5
You are given the following frequency distribution.  
-Refer to Exhibit 3-5. The mean is

Accepted Answer

A) 500 
B) 26.315 
C) 30 
D) 25 
A) 500 
B) 26.315 
C) 30 
D) 25

Question 17

Which of the following provides a measure of central location for the data?

Accepted Answer

A) standard deviation 
B) mean 
C) variance 
D) range 
A) standard deviation 
B) mean 
C) variance 
D) range

Question 18

Growth factors for the population of Chattanoonga in the past two years has been 8 and 12. The geometric mean has a value of

Accepted Answer

A) 20 
B) square root of 20 
C) square root of 96 
D) 96 
A) 20 
B) square root of 20 
C) square root of 96 
D) 96

Question 19

The coefficient of variation is

Accepted Answer

A) the same as the variance 
B) the standard deviation divided by the mean times 100 
C) the square of the standard deviation 
D) the mean divided by the standard deviation 
A) the same as the variance 
B) the standard deviation divided by the mean times 100 
C) the square of the standard deviation 
D) the mean divided by the standard deviation

Question 20

Positive values of covariance indicate

Accepted Answer

A) a positive variance of the x values 
B) a positive variance of the y values 
C) the standard deviation is positive 
D) positive relation between the independent and the dependent variables 
A) a positive variance of the x values 
B) a positive variance of the y values 
C) the standard deviation is positive 
D) positive relation between the independent and the dependent variables

Exam 3: Descriptive Statistics: Numerical Measures

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

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

The variance can never be

From a population of size 400, a random sample of 40 items is selected. The median of the sample

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.

When data are positively skewed, the mean will usually be

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 mode is

Which of the following is not a measure of dispersion?

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

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

When the data are skewed to the right, the measure of Skewness will be

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

The standard deviation of a sample was reported to be 7. The report indicated that = 980. What has been the sample size?

The most important statistical descriptive measure of the location of a data set is the

The following is a frequency distribution of grades of a sample of statistics examinations. Compute the following measures: a.The mean b.The variance c.The standard deviation d.The coefficient of variation

Exhibit 3-5 You are given the following frequency distribution. -Refer to Exhibit 3-5. The mean is

Which of the following provides a measure of central location for the data?

Growth factors for the population of Chattanoonga in the past two years has been 8 and 12. The geometric mean has a value of

The coefficient of variation is

Positive values of covariance indicate

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

Comparing Multiple Proportions, Test of Independence and Goodness of Fit

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

Index Numbers

Decision Analysis on Website

Sample Survey on Website

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