Battery Life of Tablet Computers Is of Great Concern to Customers.A

Multiple Choice

Battery life of tablet computers is 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 _**.) What conclusion might one draw by looking at the side-by-side boxplots?

A) The ANOVA assumption of Normality of the data is satisfied.
B) The population means certainly are different.
C) There is insufficient data to justify reaching any conclusion here.
D) There is different variability from brand-to-brand but not enough difference to raise concern about the common variance ANOVA assumption.
E) The consumer group should look at the Normal quantile plot to verify the common variance assumption.