2. Describing Data with Tables and Graphs

Regarding frequency tables and frequency distributions, which one of the following is true?

Which of the following frequency tables best represents a skewed data set? Select the single correct answer.

Exercises 29–34 involve large sets of data, so technology should be used. Complete lists of the data are not listed in Appendix B, but they can be downloaded from the website TriolaStats.com. Use the indicated data and construct the frequency distribution.

Earthquake Depths Use the depths (km) of the 600 earthquakes included in Data Set 24 “Earthquakes.” Use a class width of 10.0 km and begin with a lower class limit of 0.0 km. Does the frequency distribution appear to be a normal distribution?

Which of the following is least likely to be used as a criterion when choosing the number of bins ($n$ classes) in a frequency distribution?

In frequency distributions, class width is found by $?$.

Which of the following best describes a frequency distribution that is skewed to the right?

Why is it generally recommended that the number of classes in a frequency distribution be between $5$ and $20$?

Given the following frequency distribution for exam scores: $50-59$: $3$ students, $60-69$: $5$ students, $70-79$: $8$ students, $80-89$: $4$ students, which of the following represents the correct cumulative frequency for the class interval $70-79$?

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

Why is it generally recommended that the number of classes in a frequency distribution be between $5$ and $20$?

In a relative frequency distribution, what does each $f/n$ (relative frequency) represent?

In Exercises 23 and 24, construct the relative frequency distributions and answer the given questions.

Oscar Winners Construct one table (similar to Table 2-5) that includes relative frequencies based on the frequency distributions from Exercises 5 and 6, and then compare the ages of Oscar-winning actresses and actors. Are there notable differences?

Use the frequency distribution below to find the class width and class midpoints.

The following data set shows the number of overtime hours that 12 employees worked in a month. Construct a frequency distribution, using a lower class limit of 3 and a class width of 4.

A data set has a minimum value of 16 and a maximum value of 71. Without constructing a table, find the class width if you organized this data into 7 classes. Write the lower and upper class limits.

min = 16; max = 71; 7 classes.