Researchers investigated the effect of calorie-restricted diets on the longevity of mice. They conducted an experiment, randomly assigning each of 331 mice to one of 6 different diets: • A control group that were allowed to eat an unlimited amount. • R1, R2, R3, R4, and R5. These were 5 increasingly calorie restricted diets. The mice were fed the diets until they died. The survival time, in months, was recorded. As part of the analysis, the researchers carried out a one-way ANOVA. The side-by-side boxplots of the survival times and the ANOVA table are given below. 70 nths) 60

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Researchers investigated the effect of calorie-restricted diets on the longevity of
mice. They conducted an experiment, randomly assigning each of 331 mice to one of
6 different diets:
• A control group that were allowed to eat an unlimited amount.
• R1, R2, R3, R4, and R5. These were 5 increasingly calorie restricted diets.
The mice were fed the diets until they died. The survival time, in months, was
recorded. As part of the analysis, the researchers carried out a one-way ANOVA.
The side-by-side boxplots of the survival times and the ANOVA table are given
below.
70
60
50
Survival Time (Months)
40
30
20
NP
R1
Diets
Residuals 325 14477.1
-
R2
Diet
DE Sun Sq Mean Sq F value Pr(>F)
5 12267.4 2453.5 55.079 <2.2e-16
44.5
R3
D
D
R4
Which of the following statements are true? There may be more than one correct
statement; check all that area true.
R5
a) There is strong evidence that not all of the diets have the same true mean
survival time.
b) The p-value in the ANOVA table is the area to the right of 55.079 under an F
distribution with 5 and 325 degrees of freedom.
c) We know with certainty that the sample means are not all equal.
d) Since there are 6 groups, there are 12 pairwise comparisons to be
investigated
Transcribed Image Text:Researchers investigated the effect of calorie-restricted diets on the longevity of mice. They conducted an experiment, randomly assigning each of 331 mice to one of 6 different diets: • A control group that were allowed to eat an unlimited amount. • R1, R2, R3, R4, and R5. These were 5 increasingly calorie restricted diets. The mice were fed the diets until they died. The survival time, in months, was recorded. As part of the analysis, the researchers carried out a one-way ANOVA. The side-by-side boxplots of the survival times and the ANOVA table are given below. 70 60 50 Survival Time (Months) 40 30 20 NP R1 Diets Residuals 325 14477.1 - R2 Diet DE Sun Sq Mean Sq F value Pr(>F) 5 12267.4 2453.5 55.079 <2.2e-16 44.5 R3 D D R4 Which of the following statements are true? There may be more than one correct statement; check all that area true. R5 a) There is strong evidence that not all of the diets have the same true mean survival time. b) The p-value in the ANOVA table is the area to the right of 55.079 under an F distribution with 5 and 325 degrees of freedom. c) We know with certainty that the sample means are not all equal. d) Since there are 6 groups, there are 12 pairwise comparisons to be investigated
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