Exam 4: Describing Data: Displaying and Exploring Data

Given the sample information in the following table regarding public opinion on gun control, what percent of Democrats have no opinion?

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

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 median for the distribution of number of sales per hour?

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

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

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 sample 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 Pearson's coefficient of skewness here?

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

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

A box plot shows ___________.

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

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

What is the common purpose of a scatter diagram and a contingency table?

The _____________ unit of measurement is used to express the 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 19 hours. What is the first quartile for the distribution of number of sales per hour?

Percentiles divide a frequency distribution into _________ equal parts.

A dot plot shows the symmetry of a distribution.

The test scores for a class of 147 students are computed. What is the location of the test score associated with the third quartile?

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?

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 weeks were included in the study?