Chapter 13: Q.24 (page 765)
An statistic can have what values?
The statistic is greater than or equal to zero.
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What is the df for the numerator?
Judging by the statistic, do you think it is likely or unlikely that you will reject the null hypothesis?
The data shown is the recorded body temperatures of subjects as estimated from available histograms. Traditionally we are taught that the normal human body temperature is F. This is not quite correct for everyone. Are the mean temperatures among the four groups different? Calculate confidence intervals for the mean body temperature in each group and comment about the confidence intervals.
Name one assumption that must be true.
64. Three students, Linda, Tuan, and Javier, are given five laboratory rats each for a nutritional experiment. Each rat's weight is recorded in grams. Linda feeds her rats Formula A, Tuan feeds his rats Formula B, and Javier feeds his rats Formula C. At the end of a specified time period, each rat is weighed again, and the net gain in grams is recorded. Using a significance level of , test the hypothesis that the three formulas produce the same mean weight gain
| Linda's rats | Tuan's rats | Javier's rats |
| 43.5 | 47.0 | 51.2 |
| 39.4 | 40.5 | 40.9 |
| 41.3 | 38.9 | 37.9 |
| 46.0 | 46.3 | 45.0 |
| 38.2 | 44.2 | 48.6 |
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