Question 1

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 2

If the variance of a data set is correctly computed with the formula using n F1F1F1S1F1F1F10 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 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

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 5

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 F1F1F1S1F1F1F10 4, B F1F1F1S1F1F1F10 3, C F1F1F1S1F1F1F10 2, D F1F1F1S1F1F1F10 1, F F1F1F1S1F1F1F10 0. Compute Paul's semester grade point average.

Accepted Answer

The answer of Paul, a freshman at a local college...

Question 6

Which of the following is not a measure of variability of a single variable?

Accepted Answer

A) range 
B) covariance 
C) standard deviation 
D) coefficient of variation 
A) range 
B) covariance 
C) standard deviation 
D) coefficient of variation

Question 7

The measure of variability easiest to compute, but seldom used as the only measure, is the

Accepted Answer

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

Question 8

Which of the following symbols represents the mean of the sample?

Accepted Answer

A) F1F1F1S1F1F1F10 2 
B) F1F1F1S1F1F1F10 
C) F1F1F1S1F1F1F10 
D)    
A) F1F1F1S1F1F1F10 2 
B) F1F1F1S1F1F1F10 
C) F1F1F1S1F1F1F10 
D)

Question 9

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

Accepted Answer

A) F1F1F1S1F1F1F10F1F1F1S1F1F1F102 
B) F1F1F1S1F1F1F10 
C) F1F1F1S1F1F1F10 
D) N 
A) F1F1F1S1F1F1F10F1F1F1S1F1F1F102 
B) F1F1F1S1F1F1F10 
C) F1F1F1S1F1F1F10 
D) N

Question 10

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

Accepted Answer

A) F1F1F1S1F1F1F10 2 
B) F1F1F1S1F1F1F10 
C) F1F1F1S1F1F1F10 
D)   
A) F1F1F1S1F1F1F10 2 
B) F1F1F1S1F1F1F10 
C) F1F1F1S1F1F1F10 
D)

Question 11

In 2009, the average age of students at Valley State University was 22 with a standard deviation of 3.96. In 2010, the average age was 24 with a standard deviation of 4.08. In which year do the ages show a more dispersed distribution? Show your complete work and support your answer.

Accepted Answer

C.V. for 2009 F1F1F1S1F1F1F10

Question 12

The first quartile

Accepted Answer

A) contains at least one third of the data elements 
B) is the same as the 25th percentile 
C) is the same as the 50th percentile 
D) is the same as the 75th percentile 
A) contains at least one third of the data elements 
B) is the same as the 25th percentile 
C) is the same as the 50th percentile 
D) is the same as the 75th percentile

Question 13

A private research organization studying families in various countries reported the following data for the amount of time 4-year old children spent alone with their fathers each day.
   For the above sample, determine the following measures: 
a.The mean
b.The standard deviation
c.The mode
d.The 75th percentile

Accepted Answer

a.43
b.7.5

Question 14

Which of the following is not a measure of location?

Accepted Answer

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

Question 15

The number of hours worked per week for a sample of ten students is shown below.
   
a.Determine the median and explain its meaning.
b.Compute the 70th percentile and explain its meaning.
c.What is the mode of the above data? What does it signify?

Accepted Answer

a.19; approximately 50% of the

Question 16

Excel provides functions for computing the

Accepted Answer

A) mean 
B) median 
C) mode 
D) Excel provides functions for all of these. 
A) mean 
B) median 
C) mode 
D) Excel provides functions for all of these.

Question 17

Since the median is the middle value of a data set, it must always be

Accepted Answer

A) smaller than the mode 
B) larger than the mode 
C) smaller than the mean 
D) None of the other answers are correct. 
A) smaller than the mode 
B) larger than the mode 
C) smaller than the mean 
D) None of the other answers are correct.

Question 18

Which of the following symbols represents the size of the sample?

Accepted Answer

A) F1F1F1S1F1F1F10F1F1F1S1F1F1F102 
B) F1F1F1S1F1F1F10 
C) N 
D) n 
A) F1F1F1S1F1F1F10F1F1F1S1F1F1F102 
B) F1F1F1S1F1F1F10 
C) N 
D) n

Question 19

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 20

The correlation coefficient

Accepted Answer

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

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

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 for grouped data, the ____ are used to approximate the data values in each class.

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

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.

Which of the following is not a measure of variability of a single variable?

The measure of variability easiest to compute, but seldom used as the only measure, is the

Which of the following symbols represents the mean of the sample?

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

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

In 2009, the average age of students at Valley State University was 22 with a standard deviation of 3.96. In 2010, the average age was 24 with a standard deviation of 4.08. In which year do the ages show a more dispersed distribution? Show your complete work and support your answer.

The first quartile

Which of the following is not a measure of location?

The number of hours worked per week for a sample of ten students is shown below. a.Determine the median and explain its meaning. b.Compute the 70th percentile and explain its meaning. c.What is the mode of the above data? What does it signify?

Excel provides functions for computing the

Since the median is the middle value of a data set, it must always be

Which of the following symbols represents the size of the sample?

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

The correlation coefficient

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

Exam 3: Descriptive Statistics: Numerical Measures

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

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 for grouped data, the ____ are used to approximate the data values in each class.

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

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.

Which of the following is not a measure of variability of a single variable?

The measure of variability easiest to compute, but seldom used as the only measure, is the

Which of the following symbols represents the mean of the sample?

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

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

In 2009, the average age of students at Valley State University was 22 with a standard deviation of 3.96. In 2010, the average age was 24 with a standard deviation of 4.08. In which year do the ages show a more dispersed distribution? Show your complete work and support your answer.

The first quartile

Which of the following is not a measure of location?

The number of hours worked per week for a sample of ten students is shown below. a.Determine the median and explain its meaning. b.Compute the 70th percentile and explain its meaning. c.What is the mode of the above data? What does it signify?

Excel provides functions for computing the

Since the median is the middle value of a data set, it must always be

Which of the following symbols represents the size of the sample?

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

The correlation coefficient

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