Examine residuals plots to assess the validity of model assumptions? The plots a

Question

Examine residuals plots to assess the validity of model assumptions? The plots are given. 6. Suppose we also want to compare the lifetimes of the new and the old batteries to the lifetimes of the batteries of two competitors. Deter- mine at the 5% significance level whether there is a difference among the lifetimes of the four types of batteries. In addition, provide simulta- neous 95% confidence intervals for all pairwise differences in the mean battery lifetimes and comment on what they tell you. Be sure to spec- ify a statistical model under the assumptions that battery lifetimes are normally distributed and all observations are independent. The data are provided in Table 3, Be sure to provide and examine residual plots to assess the validity of model assumptions.

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Examine residuals plots to assess the validity of model assumptions? The plots are given.

The normality plot shows that there is some deviation from diagonal line. The shows that normal assumption is violated.

The fitted value plot shows that the residuals are not form a "horizontal band" around the 0 line. This suggests that the variances of the error terms are not equal.

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