When one is constructing a table representing the frequency distribution of weig

Question

When one is constructing a table representing the frequency distribution of weights (lb) of discarded textile items from Data Set 23 in Appendix B, the first two classes of a frequency distribution are 0.00-0.99 and 1.00 - 1.99. What is the class width? Using the same first two classes from Exercise 1, identify the class boundaries of the first class. The first class described in Exercise 1 has a frequency of 51. If you know only the data limits given in Exercise 1 and the frequency of 51, can you identify the original 51 data values? A stemplot is created from the intervals (min) between eruptions of the Old Faithful geyser in Yellowstone. National Park, and one row of that stemplot |2279. Identify the values represented by that row. In the California Daily 4 lottery, four digits between 0 and 9 inclusive are randomly selected each day. We normally expect that each of the ten different digits will occur about 1/10 of the time, and an analysis of last year's results shows that this did happen. Because the results are what we normally expect, is it correct to say that the distribution of selected digits is a normal distribution?

Explanation / Answer

1. The class width is the difference of upper and lower limit of class interval. Thus the class width for the given class intervals is 0.99.

2. The class boundries of the first class are 0.00 and 0.99.

3. Given the original data set with certain data limits and frequncy within this data limit, the original data values can be identified.

4. Considering the stem from the stemplot to be in units of tens , the value represented by the row

6 | 1222279 will be,

61222279 minutes.

5. The distribution of the selected digits could be a Normal distribution if the possible number of selected digits is large, that is, at least greater than 30.

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