Please explain why you choose the answers. Thanks! 8. Battery life of tablet com
ID: 3050503 • Letter: P
Question
Please explain why you choose the answers. Thanks!
8. Battery life of tablet computers i s of great concern to customers. A consumer group has tested four brands of such tablets to determine the battery life. Samples of tablets of each brand were fully charged and left to run until the battery died. The number of hours that each tablet lasted was recorded. The following graphs and tables from the analysis of the data are provided. (Note: Some entries have been omitted and replaced with) 28 26 24 20 18 16 Brand ABrand B Brand C Brand d Brands Means and Std Deviations Brand Number 14 15 14 Mean 24.63 27.71 24.87 27.32 Std Dev 4.22 2.74 2.95 3.06 Analysis of Variance Source DF Sum of Squares Brands Error Total Mean Square FRatio P-value 35.674 543.273 650.295 What conclusion might you reach based on these analyses? A) There is no evidence to suggest that the null hypothesis should be rejected. B) There is evidence to support the conclusion that all the population means are C) D) E) different There is sufficient evidence to conclude that the sample means are not equal. There is sufficient evidence to conclude that not all the population means are equal. It would be dangerous to conclude anything because the sample sizes are small and some of the ANOVA assumptions are not satisfied
Explanation / Answer
8)
Since level of significance is not given so we can not reach to any conclusion. If we take level of significance 0.05 then we can say that there is sufficient evidence to reject Null Hypothesis and If we assume level ofsignificance 0.01 then P value is not significant at 0.01 level of significance so we have no sufficient evidence to reject null hypothesis.
So option A.
7) Option E is false because correct formula is sqrt (MSE/D.FE)
SOURCE D.F S.S M.S F Ratio P value Brands 3 106.6861 35.5620 3.2723 0.0286 Errors 50 543.3841 10.8677 Totals 53 650.0702