2. Describing Data with Tables and Graphs

Why shouldn’t classes overlap when summarizing continuous data in a frequency or relative frequency distribution?

Which of the following types of data can be represented using frequency tables?

Which of the following best represents a frequency distribution of data?

Which of the following best describes the use of frequency distributions in time series data analysis?

Which of the following frequency tables represents a skewed data set?

Which of the following best describes a frequency distribution for qualitative data?

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

Use the relative frequency histogram to describe any patterns with the data.

" style="" width="320">

Which of the following best describes what a frequency distribution lists?

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.

In Exercises 15 and 16, construct the frequency polygons.

Presidents Use the frequency distribution from Exercise 14 in Section 2-1 to construct a frequency polygon. Does the graph suggest that the distribution is skewed? If so, how?

In Exercises 5–8, identify the class width, class midpoints, and class boundaries for the given frequency distribution. Also identify the number of individuals included in the summary. The frequency distributions are based on real data from Appendix B.

True or False: Suppose the first class of a frequency distribution is 0–9.9 and the second class is 10–19.9. Then, the class width is 9.9.

Describe the situations in which it is preferable to use relative frequencies over frequencies when summarizing quantitative data.

In Exercises 9–12, using a loose interpretation of the criteria for determining whether a frequency distribution is approximately a normal distribution, determine whether the given frequency distribution is approximately a normal distribution. Give a brief explanation.

Blood Platelet Counts of Females Refer to the frequency distribution from Exercise 8