Question 1

A dot plot is best applied for a data set with ________.

Accepted Answer

A)  1,000 observations
B)  50 observations
C)  more than one variable
D)  one modeE) A) and C)
F) All of the above

Question 2

Pearson's coefficient of skewness is a measure of a distribution's symmetry.

Accepted Answer

A) True 
 B)False

Question 3

The following table is a ________.

Accepted Answer

A)  dot plot
B)  stem-and-leaf display
C)  box plot
D)  contingency tableE) All of the above
F) None of the above

Question 4

A box plot shows the skewness of a distribution.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following is NOT a measure of dispersion?

Accepted Answer

A)  The interquartile range
B)  The standard deviation
C)  The 50th percentile
D)  The rangeE) B) and C)
F) A) and D)

Question 6

What statistics are needed to draw a box plot?

Accepted Answer

A)  The minimum,maximum,median,first and third quartiles
B)  The median,mean,and standard deviation
C)  The median and interquartile range
D)  The mean and standard deviationE) None of the above
F) C) and D)

Question 7

The median of a sample will always equal the ________.

Accepted Answer

A)  mode
B)  mean
C)  50th percentile
D)  All of these answers are correct.E) All of the above
F) A) and B)

Question 8

The following graph is a ________.

Accepted Answer

A)  Dot plot
B)  Stem-and-leaf diagram
C)  Box plot
D)  Contingency tableE) None of the above
F) B) and C)

Question 9

What is the possible range of values for Pearson's coefficient of skewness?

Accepted Answer

A)  −1 and +1
B)  −3 and +3
C)  0% and 100%
D)  Unlimited valuesE) B) and D)
F) A) and B)

Question 10

In the following table,

Accepted Answer

A)  there are 16 observations.
B)  there are 4 observations in the second class.
C)  there are 10 observations less than 30.
D)  there are 10 observations greater than 30.E) A) and D)
F) All of the above

Question 11

The following graph illustrates ________.

Accepted Answer

A)  a positive or direct relationship
B)  a negative or inverse relationship
C)  no relationship
D)  a distribution for a single variableE) All of the above
F) None of the above

Question 12

The following graph is ________.

Accepted Answer

A)  positively skewed
B)  negatively skewed
C)  symmetric
D)  uniformly distributedE) C) and D)
F) A) and B)

Question 13

The 50th percentile of a distribution is the same as the distribution mean.

Accepted Answer

A) True 
 B)False

Question 14

A sample of experienced typists revealed that their mean typing speed is 87 words per minute and the median typing speed is 73 words per minute. The standard deviation of typing speed is 16.9 words per minute. What is the Pearson coefficient of skewness?

Accepted Answer

A)  −2.5
B)  −4.2
C)  +4.2
D)  +2.5E) A) and B)
F) All of the above

Question 15

In a stem-and-leaf display,the leaf represents the members of a class in a frequency distribution.

Accepted Answer

A) True 
 B)False

Question 16

A dot plot can be used to show ________.

Accepted Answer

A)  the mean,median,and mode
B)  the general shape of a distribution for a nominal qualitative variable
C)  the distribution for a quantitative variable
D)  the interquartile rangeE) A) and B)
F) A) and C)

Question 17

A dot plot is useful for showing individual observations.

Accepted Answer

A) True 
 B)False

Question 18

What is the value of the Pearson coefficient of skewness for a distribution with a mean of 17,a median of 12,and a standard deviation of 6?

Accepted Answer

A)  +2.5
B)  −2.5
C)  +0.83
D)  −0.83E) None of the above
F) A) and D)

Question 19

If a distribution is negatively skewed,the distribution is not symmetrical and the long tail is to the left.

Accepted Answer

A) True 
 B)False

Question 20

A student scored in the 85th percentile on a standardized test. This means that the student scored lower than 85% of all students who took the test.

Accepted Answer

A) True 
 B)False

Exam 4: Describing Data: Displaying and Exploring Data

In a stem-and-leaf display,the leaf represents the members of a class in a frequency distribution.

Correct AnswerverifiedShow Answer

A sample of experienced typists revealed that their mean typing speed is 87 words per minute and the median typing speed is 73 words per minute. The standard deviation of typing speed is 16.9 words per minute. What is the Pearson coefficient of skewness?

Correct AnswerverifiedShow Answer

The median of a sample will always equal the ________.

Correct AnswerverifiedShow Answer

What is the possible range of values for Pearson's coefficient of skewness?

Correct AnswerverifiedShow Answer

A dot plot can be used to show ________.

Correct AnswerverifiedShow Answer

A dot plot is useful for showing individual observations.

Correct AnswerverifiedShow Answer

What statistics are needed to draw a box plot?

Correct AnswerverifiedShow Answer

A box plot shows the skewness of a distribution.

Correct AnswerverifiedShow Answer

The following table is a ________.

Correct AnswerverifiedShow Answer

The following graph illustrates ________.

Correct AnswerverifiedShow Answer

What is the value of the Pearson coefficient of skewness for a distribution with a mean of 17,a median of 12,and a standard deviation of 6?

Correct AnswerverifiedShow Answer

Pearson's coefficient of skewness is a measure of a distribution's symmetry.

Correct AnswerverifiedShow Answer

The following graph is ________.

Correct AnswerverifiedShow Answer

Which of the following is NOT a measure of dispersion?

Correct AnswerverifiedShow Answer

In the following table,

Correct AnswerverifiedShow Answer

If a distribution is negatively skewed,the distribution is not symmetrical and the long tail is to the left.

Correct AnswerverifiedShow Answer

The 50th percentile of a distribution is the same as the distribution mean.

Correct AnswerverifiedShow Answer

The following graph is a ________.

Correct AnswerverifiedShow Answer

A dot plot is best applied for a data set with ________.

Correct AnswerverifiedShow Answer

A student scored in the 85th percentile on a standardized test. This means that the student scored lower than 85% of all students who took the test.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A student scored in the 85^th percentile on a standardized test. This means that the student scored lower than 85% of all students who took the test.

Correct Answer
verified