Question 1

The correlation coefficient measures the strength of a linear relationship between two variables.

Accepted Answer

A) True 
 B)False

Question 2

Calculate the correlation coefficient between the size of the sales force and gross sales.

Accepted Answer

The answer of Calculate the correlation coefficient between the size...

Question 3

Which of the following statements is true?

Accepted Answer

A) The correlation coefficient is always greater than the covariance. 
B) The covariance is always greater than the correlation coefficient. 
C) The covariance may be equal to the correlation coefficient. 
D) Neither the covariance nor the correlation coefficient can be equal to zero. 
A) The correlation coefficient is always greater than the covariance. 
B) The covariance is always greater than the correlation coefficient. 
C) The covariance may be equal to the correlation coefficient. 
D) Neither the covariance nor the correlation coefficient can be equal to zero.

Question 4

In a positively skewed distribution,the mode is greater than the median.

Accepted Answer

A) True 
 B)False

Question 5

For any distribution,there are an equal number of observations above and below the mean.

Accepted Answer

A) True 
 B)False

Question 6

The first four deviations from the mean in a sample of n = 5 reaction times were .6,.9,1.0,and 1.5.What is the fifth deviation from the mean? Provide a sample for which these are the five deviations from the mean.

Accepted Answer

Let d denote the fifth deviation.Then .6

Question 7

Categorical data are best described by the mode.

Accepted Answer

A) True 
 B)False

Question 8

The variance of a set of data can never be negative.

Accepted Answer

A) True 
 B)False

Question 9

For the following scatter plot,what would be your best estimate of the correlation coefficient?

Accepted Answer

A) 1.0 
B) 0.7 
C) 0.3 
D) 0.1 
A) 1.0 
B) 0.7 
C) 0.3 
D) 0.1

Question 10

For a data set with 10 numerical values arranged in ascending order,the median is the arithmetic mean of the:

Accepted Answer

A) third and fourth values. 
B) fourth and fifth values. 
C) fifth and sixth values. 
D) first and tenth values. 
A) third and fourth values. 
B) fourth and fifth values. 
C) fifth and sixth values. 
D) first and tenth values.

Question 11

Suppose you are told that sales this year are 30% higher than they were six years ago.What has been the average annual increase in sales over the past six years?

Accepted Answer

A) 5.0% 
B) 4.5% 
C) 4% 
D) 3.5% 
A) 5.0% 
B) 4.5% 
C) 4% 
D) 3.5%

Question 12

Looking at the scatter plot below,what value would be your best estimate for the correlation coefficient?

Accepted Answer

A) -0.7 
B) -0.3 
C) -1.0 
D) 0)0 
A) -0.7 
B) -0.3 
C) -1.0 
D) 0)0

Question 13

The mean is generally the preferred measure of central tendency to describe numerical data,but not categorical data.

Accepted Answer

A) True 
 B)False

Question 14

The following ten scores were obtained on a 20-point quiz: 4,5,8,9,11,13,15,18,18,and 20.The teacher computed the usual descriptive measures of center (central tendency)and variability (dispersion)for these data,and then discovered an error was made.One of the 18s should have been a 16.Which of the following measures,calculated on the corrected data,would change from the original computation?

Accepted Answer

A) median 
B) arithmetic mean 
C) range 
D) geometric mean 
A) median 
B) arithmetic mean 
C) range 
D) geometric mean

Question 15

In the calculation of the arithmetic mean for grouped data,which value is used to represent all the values in a particular class?

Accepted Answer

A) the lower limit of the class 
B) the upper limit of the class 
C) the frequency of the class 
D) the midpoint of the class 
A) the lower limit of the class 
B) the upper limit of the class 
C) the frequency of the class 
D) the midpoint of the class

Question 16

The first quartile,Q1,is a number such that at most 25 of the data values are smaller in value than Q1,and at most 75 of the data values are larger.

Accepted Answer

A) True 
 B)False

Question 17

For any distribution,the number of values above the mean and below it is the same.

Accepted Answer

A) True 
 B)False

Question 18

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A small accounting office is trying to determine its staffing needs for the coming tax season.The manager has collected the following data: 46,27,79,57,99,75,48,89,and 85.These values represent the number of returns the office completed each year over the entire nine years it has been doing tax returns.
-For this data,what is the coefficient of variation for the number of tax returns completed each year?

Accepted Answer

σ = @#IMG-DLM& 
= 22.46
CV = (

Question 19

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
A set of data is mounded,with a mean of 500 and a variance of 576.
-Approximately what proportion of the observations is between 428 and 572?

Accepted Answer

The values 428 and 572 are within ± thre

Question 20

For which type of distribution is the mean usually less than the median when measuring continuous numerical unimodal data?

Accepted Answer

A) skewed-left 
B) skewed-right 
C) symmetrical 
D) flat 
A) skewed-left 
B) skewed-right 
C) symmetrical 
D) flat

The correlation coefficient measures the strength of a linear relationship between two variables.

Calculate the correlation coefficient between the size of the sales force and gross sales.

Which of the following statements is true?

In a positively skewed distribution,the mode is greater than the median.

For any distribution,there are an equal number of observations above and below the mean.

The first four deviations from the mean in a sample of n = 5 reaction times were .6,.9,1.0,and 1.5.What is the fifth deviation from the mean? Provide a sample for which these are the five deviations from the mean.

Categorical data are best described by the mode.

The variance of a set of data can never be negative.

For the following scatter plot,what would be your best estimate of the correlation coefficient?

For a data set with 10 numerical values arranged in ascending order,the median is the arithmetic mean of the:

Suppose you are told that sales this year are 30% higher than they were six years ago.What has been the average annual increase in sales over the past six years?

Looking at the scatter plot below,what value would be your best estimate for the correlation coefficient?

The mean is generally the preferred measure of central tendency to describe numerical data,but not categorical data.

In the calculation of the arithmetic mean for grouped data,which value is used to represent all the values in a particular class?

The first quartile,Q₁,is a number such that at most 25 of the data values are smaller in value than Q₁,and at most 75 of the data values are larger.

For any distribution,the number of values above the mean and below it is the same.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A set of data is mounded,with a mean of 500 and a variance of 576. -Approximately what proportion of the observations is between 428 and 572?

For which type of distribution is the mean usually less than the median when measuring continuous numerical unimodal data?

Describing Data: Graphical

Probability

Discrete Random Variables and Probability Distributions

Continuous Random Variables and Probability Distributions

Sampling and Sampling Distributions

Estimation: Single Population

Estimation: Additional Topics

Hypothesis Testing: Single Population

Hypothesis Testing: Additional Topics

Simple Regression

Multiple Regression

Additional Topics in Regression Analysis

Analysis of Categorical Data

Analysis of Variance

Time-Series Analysis and Forecasting

Additional Topics in Sampling

Filters

Exam 2: Describing Data: Numerical

The correlation coefficient measures the strength of a linear relationship between two variables.

Calculate the correlation coefficient between the size of the sales force and gross sales.

Which of the following statements is true?

In a positively skewed distribution,the mode is greater than the median.

For any distribution,there are an equal number of observations above and below the mean.

The first four deviations from the mean in a sample of n = 5 reaction times were .6,.9,1.0,and 1.5.What is the fifth deviation from the mean? Provide a sample for which these are the five deviations from the mean.

Categorical data are best described by the mode.

The variance of a set of data can never be negative.

For the following scatter plot,what would be your best estimate of the correlation coefficient?

For a data set with 10 numerical values arranged in ascending order,the median is the arithmetic mean of the:

Suppose you are told that sales this year are 30% higher than they were six years ago.What has been the average annual increase in sales over the past six years?

Looking at the scatter plot below,what value would be your best estimate for the correlation coefficient?

The mean is generally the preferred measure of central tendency to describe numerical data,but not categorical data.

In the calculation of the arithmetic mean for grouped data,which value is used to represent all the values in a particular class?

The first quartile,Q1,is a number such that at most 25 of the data values are smaller in value than Q1,and at most 75 of the data values are larger.

For any distribution,the number of values above the mean and below it is the same.

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION: A set of data is mounded,with a mean of 500 and a variance of 576. -Approximately what proportion of the observations is between 428 and 572?

For which type of distribution is the mean usually less than the median when measuring continuous numerical unimodal data?

Describing Data: Graphical

Probability

Discrete Random Variables and Probability Distributions

Continuous Random Variables and Probability Distributions

Sampling and Sampling Distributions

Estimation: Single Population

Estimation: Additional Topics

Hypothesis Testing: Single Population

Hypothesis Testing: Additional Topics

Simple Regression

Multiple Regression

Additional Topics in Regression Analysis

Analysis of Categorical Data

Analysis of Variance

Time-Series Analysis and Forecasting

Additional Topics in Sampling

Filters

The first quartile,Q₁,is a number such that at most 25 of the data values are smaller in value than Q₁,and at most 75 of the data values are larger.