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Exam 4: Describing Data: Displaying and Exploring Data

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Question 31

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For the following data, what is the interquartile range?

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Question 32

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In the following graph,

A) There are 16 observations.
B) There are four observations in the second class.
C) There are ten observations less than thirty.
D) There are ten observations greater than thirty.

E) A) and B)
F) A) and C)

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Question 33

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

The research director of a large oil company studied the buying habits of consumers with respect to the amount of gasoline purchased at full-service pumps. The arithmetic mean amount is 11.5 gallons and the median amount is 11.95 gallons. The standard deviation of the sample is 4.5 gallons. What is the Pearson's coefficient of skewness? ________

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, what is the interquartile range? __________.

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 How many observations are in the third class? ___________

What graph shows the interquartile range? ___________

A box plot shows

If the coefficient of skewness is equal to zero, the shape of the distribution is

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

A dot plot is best applied when

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 median for the distribution of number of sales per hour? ____________

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 How often did the company ship more 140 boats in a week? __________

A scatter diagram of sales versus production is labeled with sales on the Y-axis and production on the X-axis.

If the mean of a distribution is smaller than the median and mode, what is the sign of Pearson's coefficient of skewness? _______________

Quartiles divide a distribution into four equal parts.

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 How often did the company ship 111 boats in a week? ____________

A box plot shows the relative symmetry of a distribution.

The Pearson's coefficient of skewness (Sk) measures the amount of skewness and may range from -3.0 to +3.0. It is computed by subtracting the median from the mean, multiplying the result by 3 and dividing by _______________.

A stem-and-leaf display includes the following row: 3 | 0 1 3 5 7 9. Assume that the data is rounded to the nearest whole number.