Test the claim that the samples come from populations with the same mean. Assume that the populations are normally distributed with the same variance. Use a significance level of 0.01. Show work. 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. Brand 1 Brand 2 Brand 3 260 181 238 218 240 257 184 162 241 219 218 213 Do the data indicate that there is a difference in mean lifetime for the three brands of ballpoint pens
25. Test the claim that the samples come from populations with the same mean. Assume that the populations are
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.
Brand 1 Brand 2 Brand 3
260 181 238
218 240 257
184 162 241
219 218 213
Do the data indicate that there is a difference in mean lifetime for the three brands of ballpoint pens?
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