The accompanying frequency distribution summarizes data on the number of times smokers who had successfully quit smoking attempted to quit before their final successful attempt (€œDemographic Variables, Smoking Variables, and Outcome Across Five Studies,€ Health Psychology [2007]: 278€“287).

Assume that no one had made more than 10 unsuccessful attempts, so that the last entry in the frequency distribution can be regarded as 5€“10 attempts. Summarize this data set using a histogram. Be careful€”the class intervals are not all the same width, so you will need to use a density scale for the histogram. Also remember that for a discrete variable, the bar for 1 will extend from 0.5 to 1.5. Think about what this will mean for the bars for the 3€“4 group and the 5€“10 group.

Frequency 778 306 274 221 238 Number of Attempts 3-4 5 or more