A consumer magazine wants to compare the lifetimes of ballpoint pens of three different types. The...

A consumer magazine wants to compare the lifetimes of ballpoint pens of three different types. The magazine takes a random sample of pens of each type in the following table. Assume that the populations are normally distributed with the same variance.

Brand 1 Brand 2 Brand 3

260 187 237

218 245 251

185 164 246

227 219 218

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orchestra answered 1 year ago

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