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Exam 4: Describing Data: Displaying and Exploring Data

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Question 21

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The range of the coefficient of skewness is ____________.

A) Values greater than or equal to zero or always positive
B) Values less than or equal to zero or always negative
C) Both positive and negative values
D) Values between -1 and +1

E) A) and B)
F) None of the above

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Question 22

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The ______________ is used to measure the relative symmetry of a distribution.

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Question 23

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Given the sample information in the following table regarding public opinion on gun control, who is more likely to favor gun control?

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

The following is an example of a ___________________________.

The coefficient of skewness is the standard deviation divided by the mean.

A telemarketing firm is monitoring the performance of its employees based on the number of sales per hour. One employee had the following sales for the last 19 hours. What is the first quartile for the distribution of number of sales per hour?

A box plot shows ___________.

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

In a distribution, the second quartile corresponds with the __________.

The following graph is a

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?

A dot plot is useful for showing individual observations.

For the following data, what is the interquartile range?

A relationship between two nominal variables is summarized by a contingency table.

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.

A dot plot shows the symmetry of a distribution.

A box plot shows the skewness of a distribution.

In a positively skewed distribution, the 50^th percentile is the same as the ______________.

For the following data, are any of the observations an outlier?