Mathematics, 06.04.2021 01:00 hope10079

1. An article in the November 1983 Consumer Reports compared various types of batteries. The average lifetimes of Duracell Alkaline AA batteries and Eveready Energizer Alkaline AA batteries were given as 4.1 h and 4.5 h, respectively. Suppose these are the population average lifetimes. a. Let X be the sample average lifetime of 100 Duracell batteries and Y be the sample average lifetime of 100 Eveready batteries. What is the mean value of X Y (i. e., where is the distribution of X Y centered)? How does your answer depend on the specified sample sizes?

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