2. Describing Data with Tables and Graphs

"In Problems 21 and 22, find (a) the number of classes, (b) the class limits, and (c) the class width.

Earthquakes The following data represent the magnitude of earthquakes worldwide in October 2018."

Construct a cumulative frequency distribution and an ogive for the data set using six classes. Then describe the location of the greatest increase in frequency.

Retirement Ages

Data set: Retirement ages of 35 English professors 72 62 55 61 53 62 65 66 69 55 66 63 67 69 55 65 67 57 67 68 73 75 65 54 71 57 52 58 58 71 72 67 63 65 61

Testing Goodness-of-Fit with a Normal Distribution Refer to Data Set 1 “Body Data” in Appendix B for the heights of females.

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a. Enter the observed frequencies in the table above.

Which type of frequency distribution would best summarize the distribution of number of hours worked by volunteers in a community project?

The data set represents the number of movies that a sample of 20 people watched in a year.

121 148 94 142 170 88 221 106 18 67

149 28 60 101 134 168 92 154 53 66

b. Display the data using a frequency histogram and a frequency polygon on the same axes.

In a $\square$ distribution, the frequency of a class is replaced with a proportion or percent.

In a relative frequency distribution, what does each $relativefrequency$ represent?

College Survey In a national survey conducted by the Centers for Disease Control to determine health-risk behaviors among college students, college students were asked, “How often do you wear a seat belt when driving a car?” The frequencies were as follows:

g. Compute the relative frequencies of “Never,” “Rarely,” “Sometimes,” “Most of the time,” and “Always,” excluding those that do not drive. Compare with those in Problem 13. What might you conclude?

Which of the following best describes the difference between $relative frequency$ and $cumulative frequency$ in a frequency distribution?

Which of the following best explains when one frequency distribution provides a better summary of the data than another?

Which of the following is a primary benefit of representing data sets using frequency distributions?

In a relative frequency distribution, what does each $relativefrequency$ represent?

When comparing two frequency distributions that summarize the same dataset, which of the following criteria best determines if one provides a better summary than the other?

Which of the following best describes the difference between $relative frequency$ and $cumulative frequency$ in a frequency distribution?