A laboratory technician is timed 20 times in the performance of a task, getting (bar{x}=7.9) and (s=1.2

Question:

A laboratory technician is timed 20 times in the performance of a task, getting $\bar{x}=7.9$ and $s=1.2 \mathrm{~min}-$ utes. 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?

Fantastic news! We've Found the answer you've been seeking!