Hypothesis Question: Ages of Grandmothers A researcher hypothesizes that the average age for a woman to become a grandmother is higher in his hometown than average, which is 50 years old. Assume the population standard deviation is 5 years. A random sample of 40 grandmothers from the researcher's hometown is selected, and the mean age of the sample is 53.2 years old. Test the claim at a = 0.1. Reply