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Exam 4: Describing Data: Displaying and Exploring Data

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Question 21

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In a contingency table, we describe the relationship between

A) two variables measured at the ordinal or nominal level.
B) two variables, one measured as an ordinal variable and the other as a ratio variable.
C) two variables measured at the interval or ratio level.
D) a variable measure on the interval or ratio level and time.

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Question 22

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A stem-and-leaf display includes the following row: 5 | 10 11 31 52 79 98. Assume that the data is rounded to the nearest whole number.

A) The frequency of the class is seven.
B) The minimum value in the class is 5.
C) The maximum value in the class is 98.
D) The class interval is 100.

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Question 23

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In a scatter diagram, we describe the relationship between

For the following data, find the information required to construct a box plot.

The following stem and leaf display reports the number of boats shipped per week by Ottertail Boats, Inc. 11| 1 5 9 12| 0 1 2 2 6 9 13| 0 1 2 3 4 5 5 7 8 8 9 14| 2 6 8 15| 0 1 2 4 5 7 8 9 16| 1 5 7 9 What is the median value? _______________

Percentiles divide a frequency distribution into _________ equal parts.

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 20 hours. What is the third quartile for the distribution of number of sales per hour? _____________

A dot plot can be used to show

A scatter diagram of sales versus production may be constructed by plotting the minimum, first quartile, median, third quartile, and the maximum values of each variable.

A stem-and-leaf diagram shows the actual data values.

Using the following statistics to describe a distribution of data, what is the interquartile range? Minimum = 10 Q1 = 25 Median = 50 Q3 = 75 Maximum = 95

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

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

What unit of measurement is used to express the coefficient of skewness? _________

What is the difference between a scatter diagram and a contingency table?

The following graph illustrates

A scatter diagram shows the ____________ between two interval or ratio variables.

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 20 hours. For the distribution of number of sales per hour, 50% are equal or greater than ___________.

The following graph is a

In a negatively skewed distribution, the coefficient of skewness is _______________.