Chapter 2 Discussion Board

Answer the following questions based on what you have learned in Chapter 2 so far. You will receive points as listed below. Once you have submitted your answers you will be able to see other students’ submissions. Please comment on at least one other student’s post; this will be worth 1 additional point.

Were the subjects weighed or did they report their weights?

One fascinating aspect of statistics is that we can some-times learn how data were collected by analyzing the data. Table 2-12 and Table 2-13 both include weights (pounds) of 50 randomly selected adult male subjects. When subjects are included in the National Health and Interview Survey, there is a requirement that subjects must be weighed on a scale. One of the two data sets was obtained by using a scale to actually weigh the subjects, but the other data set consists of weights that were reported by the subjects when they were asked how much they weighed. With a clever use of common sense, we know that when subjects report their weights, the results are often rounded to a value conveniently ending in a 0 or 5. Given this, we are able to deduce how the data were collected by analyzing the last digits of the weights.

TABLE 2-12 Weights (lbs) of 50 Adult Males

TABLE 2-13 Weights (lbs) of 50 Adult Males

Use the methods from Chapter 2 to address the following questions:

1. Construct a frequency distribution and histogram of the last digits of the weights in Table 2-12. (2 points)

2. Construct a frequency distribution and histogram of the last digits of the weights in Table 2-13. (2 points)

3. Compare the results from questions 1 and 2. Determine which table includes weights obtained by using a scale and which table includes weights that were reported by the subjects. (1 point)

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