The article Frost Belt Feels Labor Drain (USA Today, May 1, 2008) points out that even though total population is
a. The smallest value in the data set is _11.9 and the largest value is 22.0. One possible choice of stems for a stem-and-leaf display would be to use the tens digit, resulting in stems of -1, - 0, 0, 1, and 2. Notice that because there are both negative and positive values in the data set, we would want to use two 0 stems€”one where we can enter leaves for the negative percent changes that are between 0 and - 9.9, and one where we could enter leaves for the positive percent changes that are between 0 and 9.9. Construct a stem-and-leaf plot using these five stems. (Hint: Think of each data value as having two digits before the decimal place, so 4.1 would be regarded as 04.1.)
b. Using two-digit stems would result in more than 30 stems, which is more than we would usually want for a stem-and-leaf display. Describe a strategy for using repeated stems that would result in a stemand- leaf display with about 10 stems.
c. The article described €œthe frost belt€ as the cold part of the country€”the Northeast and Midwest€” noting that states in the Frost Belt generally showed a decline in the number of people in the 25- to 44-year-old age group. How would you describe the group of states that saw a marked increase in the number of 25- to 44-year-olds?
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