Question 1

Boxplots are graphical displays that

Accepted Answer

A)  emphasize the basic characteristics of the data. 
B)  focus on the median and spread of the data. 
C)  allow us to visually see how two or more distributions compare. 
D)  all of the above 
A)  emphasize the basic characteristics of the data. 
B)  focus on the median and spread of the data. 
C)  allow us to visually see how two or more distributions compare. 
D)  all of the above D

Question 2

Answer the following questions based on the graph below. 
   
a. Is the graph symmetrical? 
b. Is the graph unimodal or bimodal? 
c. Do the data appear skewed?   If so, positively or negatively? 
d. Do there appear to be outliers? If so, for what values?

Accepted Answer

a. The graph is not symmetrical. 
b. The graph is unimodal. 
c. The data are positively skewed. 
d. There are no outliers.

Question 3

A negatively skewed distribution

Accepted Answer

A)  has a tail pointing to the left. 
B)  has a tail pointing to the right. 
C)  is symmetric. 
D)  is also positively skewed. 
A)  has a tail pointing to the left. 
B)  has a tail pointing to the right. 
C)  is symmetric. 
D)  is also positively skewed. A

Question 4

If the distribution of the ages of people were positively skewed, which of the following is most likely correct?

Accepted Answer

A)  There are about the same number of young people as old people. 
B)  There are more young people than old people. 
C)  There are more old people than young people. 
D)  none of the above 
A)  There are about the same number of young people as old people. 
B)  There are more young people than old people. 
C)  There are more old people than young people. 
D)  none of the above

Question 5

A stem-and-leaf display is often

Accepted Answer

A)  a simplified representation of the underlying data. 
B)  a quick way to draw a histogram. 
C)  more informative than the corresponding histogram. 
D)  all of the above 
A)  a simplified representation of the underlying data. 
B)  a quick way to draw a histogram. 
C)  more informative than the corresponding histogram. 
D)  all of the above

Question 6

Inglehart (1990) presented data on the mean Satisfaction with Life scores for 24 developed countries. These data follow:
 
A histogram of these data would be
​

Accepted Answer

A)  reasonably symmetric. 
B)  positively skewed. 
C)  very bimodal. 
D)  impossible to draw. 
A)  reasonably symmetric. 
B)  positively skewed. 
C)  very bimodal. 
D)  impossible to draw.

Question 7

The next six questions are based on the following data.  
-Which graphical technique do you think displays the data least effectively? Why?

Accepted Answer

The frequency distribution is least effe

Question 8

Skewness refers to how symmetrical or assymetrical a distribution is.

Accepted Answer

A) True 
 B)False

Question 9

The next six questions are based on the following data.  
-Create a frequency distribution for these data.

Accepted Answer

A chart and a graphi

Question 10

If you created a stem-and-leaf display of the math SAT scores of all entering students in a large Midwestern state university, the leaves would most likely be

Accepted Answer

A)  the numbers 2 through 8. 
B)  the numbers 0 through 9 (with code |6|5 = 650). 
C)  t, f, c. 
D)  the symbols * and . 
A)  the numbers 2 through 8. 
B)  the numbers 0 through 9 (with code |6|5 = 650). 
C)  t, f, c. 
D)  the symbols * and .

Question 11

On October 25, 1978 the Washington Post presented a graphic showing the declining purchasing power of the U.S. dollar. What was worth $1 in 1958 was worth only $0.44 in 1978. They illustrated the decline in value by showing a dollar that was 3 inches by 1 inch in 1959, and one that was 1.32 inches (44% of 3 inches) by .44 inches in 1978. What is wrong with this kind of a display?

Accepted Answer

A)  You can't equate dollars in 1958 with dollars in 1978. 
B)  The dollar actually increased in purchasing power over that period of time. 
C)  There is nothing wrong with doing this. 
D)  The area of the dollar is reduced by more than .44%. 
A)  You can't equate dollars in 1958 with dollars in 1978. 
B)  The dollar actually increased in purchasing power over that period of time. 
C)  There is nothing wrong with doing this. 
D)  The area of the dollar is reduced by more than .44%.

Question 12

The data in the previous question show a much higher incidence of low birth weight babies from mothers who smoke. This finding is likely to be a reliable one because

Accepted Answer

A)  everyone knows that smoking is a bad thing. 
B)  the smokers rate of low birth weight is twice that of the non-smokers. 
C)  the pattern of differences occurs reliably over each of 5 years. 
D)  there is a general increase in low birth weight over the years. 
A)  everyone knows that smoking is a bad thing. 
B)  the smokers rate of low birth weight is twice that of the non-smokers. 
C)  the pattern of differences occurs reliably over each of 5 years. 
D)  there is a general increase in low birth weight over the years.

Question 13

Use two terms to describe the following data.

Accepted Answer

Possible answers inc

Question 14

Answer the following questions based on the graph below. 
   
a. Is the graph symmetrical? 
b. Is the graph unimodal or bimodal? 
c. Do the data appear skewed?   If so, positively or negatively? 
d. Do there appear to be outliers? If so, for what values?

Accepted Answer

a. Yes, the graph is symmetric

Question 15

On a recent fundraising drive, most of the 30 volunteers raised between $10 and $50 each. However, Brian and Karen each raised over $100. Which of the following is true?

Accepted Answer

A)  The amounts of money raised by Brian and Karen are outliers. 
B)  The data would best be represented three-dimensionally. 
C)  The data appear negatively skewed. 
D)  The data should be represented on a back-to-back stem-and-leaf display. 
A)  The amounts of money raised by Brian and Karen are outliers. 
B)  The data would best be represented three-dimensionally. 
C)  The data appear negatively skewed. 
D)  The data should be represented on a back-to-back stem-and-leaf display.

Question 16

A normal distribution must

Accepted Answer

A)  have outliers. 
B)  be symmetric. 
C)  be positively skewed. 
D)  be negatively skewed. 
A)  have outliers. 
B)  be symmetric. 
C)  be positively skewed. 
D)  be negatively skewed.

Question 17

The onset of eating disorders was shown to occur most often during puberty and during the late teen years in girls. A distribution of the frequencies of onset of eating disorders by age would most likely be

Accepted Answer

A)  unimodal. 
B)  normal. 
C)  bimodal. 
D)  all of the above 
A)  unimodal. 
B)  normal. 
C)  bimodal. 
D)  all of the above

Question 18

Assume that we had the following set of data:
 
T hese data would most likely be characterized as

Accepted Answer

A)  positively skewed. 
B)  normal. 
C)  negatively skewed. 
D)  uniformly distributed. 
A)  positively skewed. 
B)  normal. 
C)  negatively skewed. 
D)  uniformly distributed.

Question 19

Outliers are

Accepted Answer

A)  extreme or unusual values. 
B)  the lowest value in a data set. 
C)  the lowest and highest scores in a data set. 
D)  all of the above 
A)  extreme or unusual values. 
B)  the lowest value in a data set. 
C)  the lowest and highest scores in a data set. 
D)  all of the above

Question 20

An outlier refers to data that falls toward the middle of a distribution.

Accepted Answer

A) True 
 B)False

Boxplots are graphical displays that

Answer the following questions based on the graph below. a. Is the graph symmetrical? b. Is the graph unimodal or bimodal? c. Do the data appear skewed? If so, positively or negatively? d. Do there appear to be outliers? If so, for what values?

A negatively skewed distribution

If the distribution of the ages of people were positively skewed, which of the following is most likely correct?

A stem-and-leaf display is often

Inglehart (1990) presented data on the mean Satisfaction with Life scores for 24 developed countries. These data follow: A histogram of these data would be

The next six questions are based on the following data. -Which graphical technique do you think displays the data least effectively? Why?

Skewness refers to how symmetrical or assymetrical a distribution is.

The next six questions are based on the following data. -Create a frequency distribution for these data.

If you created a stem-and-leaf display of the math SAT scores of all entering students in a large Midwestern state university, the leaves would most likely be

The data in the previous question show a much higher incidence of low birth weight babies from mothers who smoke. This finding is likely to be a reliable one because

Use two terms to describe the following data.

Answer the following questions based on the graph below. a. Is the graph symmetrical? b. Is the graph unimodal or bimodal? c. Do the data appear skewed? If so, positively or negatively? d. Do there appear to be outliers? If so, for what values?

On a recent fundraising drive, most of the 30 volunteers raised between $10 and $50 each. However, Brian and Karen each raised over $100. Which of the following is true?

A normal distribution must

The onset of eating disorders was shown to occur most often during puberty and during the late teen years in girls. A distribution of the frequencies of onset of eating disorders by age would most likely be

Assume that we had the following set of data: T hese data would most likely be characterized as

Outliers are

An outlier refers to data that falls toward the middle of a distribution.

Introduction

Basic Concepts

Measures of Central Tendency

Measures of Variability

The Normal Distribution

Basic Concepts of Probability

Sampling Distributions and Hypothesis Testing

Correlation

Regression

Multiple Regression

Hypothesis Tests Applied to Means: One Sample

Hypothesis Tests Applied to Means: Two Related Samples

Hypothesis Tests Applied to Means: Two Independent Samples

Power

One-Way Analysis of Variance

Factorial Analysis of Variance

Repeated-Measures Analysis of Variance

Chi-Square

Nonparametric and Resampling Statistical Tests

Meta-Analysis

Filters

Exam 3: Displaying Data

Boxplots are graphical displays that

Answer the following questions based on the graph below. a. Is the graph symmetrical? b. Is the graph unimodal or bimodal? c. Do the data appear skewed? If so, positively or negatively? d. Do there appear to be outliers? If so, for what values?

A negatively skewed distribution

If the distribution of the ages of people were positively skewed, which of the following is most likely correct?

A stem-and-leaf display is often

Inglehart (1990) presented data on the mean Satisfaction with Life scores for 24 developed countries. These data follow: A histogram of these data would be ​

The next six questions are based on the following data. -Which graphical technique do you think displays the data least effectively? Why?

Skewness refers to how symmetrical or assymetrical a distribution is.

The next six questions are based on the following data. -Create a frequency distribution for these data.

If you created a stem-and-leaf display of the math SAT scores of all entering students in a large Midwestern state university, the leaves would most likely be

The data in the previous question show a much higher incidence of low birth weight babies from mothers who smoke. This finding is likely to be a reliable one because

Use two terms to describe the following data.

Answer the following questions based on the graph below. a. Is the graph symmetrical? b. Is the graph unimodal or bimodal? c. Do the data appear skewed? If so, positively or negatively? d. Do there appear to be outliers? If so, for what values?

On a recent fundraising drive, most of the 30 volunteers raised between $10 and $50 each. However, Brian and Karen each raised over $100. Which of the following is true?

A normal distribution must

The onset of eating disorders was shown to occur most often during puberty and during the late teen years in girls. A distribution of the frequencies of onset of eating disorders by age would most likely be

Assume that we had the following set of data: T hese data would most likely be characterized as

Outliers are

An outlier refers to data that falls toward the middle of a distribution.

Introduction

Basic Concepts

Measures of Central Tendency

Measures of Variability

The Normal Distribution

Basic Concepts of Probability

Sampling Distributions and Hypothesis Testing

Correlation

Regression

Multiple Regression

Hypothesis Tests Applied to Means: One Sample

Hypothesis Tests Applied to Means: Two Related Samples

Hypothesis Tests Applied to Means: Two Independent Samples

Power

One-Way Analysis of Variance

Factorial Analysis of Variance

Repeated-Measures Analysis of Variance

Chi-Square

Nonparametric and Resampling Statistical Tests

Meta-Analysis

Filters

Inglehart (1990) presented data on the mean Satisfaction with Life scores for 24 developed countries. These data follow: A histogram of these data would be