Author Question: If, in a hypothesis test, the null hypothesis is actually true, which type of mistake can be made? ... (Read 223 times)

sdfghj · **on:** Jul 24, 2018

If, in a hypothesis test, the null hypothesis is actually true, which type of mistake can be made?
a. Type 1.
b. Type 2.
c. Type 1 if it's a one-sided test and Type 2 if it's a two-sided test.
d. Type 2 if it's a one-sided test and Type 1 if it's a two-sided test.

Question 2

Items produced by a certain process are supposed to weigh 90 grams. However, the process is such that there is variability in the items produced and they do not all weigh exactly 90 grams. The distribution of weights is normal with a mean of 89.8 grams and a standard deviation of 1.1 gram. If we have a random sample of 10 of these items, what is the probability that their average weight exceeds 91 grams?