A leading American electric vehicle company wishes to determine whether four types of batteries for electric vehicles perform equally well. Four types of batteries for electric vehicle were randomly...

A leading American electric vehicle company wishes to determine whether four types of batteries for electric vehicles perform equally well. Four types of batteries for electric vehicle were randomly selected and installed in the three different models. The number of hours of use for each battery is given below.

GRAPH PROVIDED VIA PICTURE

A. Use the analysis of variance (ANOVA) procedure for completely randomized designs to determine whether there is a significant difference in the mean useful life of the four types of batteries. (Ignore the fact that there are different electric vehicle models.) Include the ANOVA table.

B. Now consider the three different Models (X,Y,Z) and carry out the analysis of variance procedure for a randomized block design. Include the ANOVA table.

C. Compare the results in parts (a) and (b). Discuss why the results in (a) is different from (b).