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The accompanying two-way table was constructed using data in the article “Television Viewing and Physical Fitness in Adults” (Research Quarterly for Exercise and Sport, 1990: 315–320). The author hoped to determine whether time spent watching television is associated with cardiovascular fitness. Subjects were asked about their television-viewing habits and were classified as physically fit if they scored in the excellent or very good category on a step test. We include Minitab output from a chi-squared analysis. The four TV groups corresponded to different amounts of time per day spent watching TV (0, 1–2, 3–4, or 5 or more hours). The 168 individuals represented in the first column were those judged physically fit. Expected counts appear below observed counts, and Minitab displays the contribution to χ2 from each cell. State and test the appropriate hypotheses using α = .05.
| 1 | 2 | Total | |
| 1 | 35 | 147 | 182 |
| 25.48 | 156 .52 | ||
| 2 | 101 | 629 | 730 |
| 102.20 | 627.80 | ||
| 3 | 28 | 222 | 250 |
| 35.00 | 215.00 | ||
| 4 | 4 | 34 | 38 |
| 5.32 | 32 .68 | ||
| Total | 168 | 1032 | 1200 |
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Chapter 14 Solutions
WebAssign for Devore's Probability and Statistics for Engineering and the Sciences, 9th Edition [Instant Access], Single-Term
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- 1. Show, by using characteristic, or moment generating functions, that if 1 fx(x): x) = ½exarrow_forward1990) 02-02 50% mesob berceus +7 What's the probability of getting more than 1 head on 10 flips of a fair coin?arrow_forward9. The concentration function of a random variable X is defined as Qx(h) sup P(x≤x≤x+h), h>0. = x (a) Show that Qx+b(h) = Qx(h).arrow_forward
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