A laboratory technician is timed 20 times in the performance of a task, getting x(x has a line over it) x=7.9 and s= 1.2 minutes. If the probability of a type I error is to be at most 0.05, does this constitute evidence against the null hypothesis that the average time is less than or equal to 7.5 minutes?

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Noll hypothenis c Ho u75 Alternative hy pothesis Ha Ms 75 79 S 12 n 20 ... View the full answer