A manufacturer produces crankshafts for an automo engine. The wear of the cranksha? after 100,000 miles measured in .0001inches) is of interest because it is likely to have an effect on warranty claims. A random sample of n = 15 shafts is tested and xbar = 2.78. It is known that sigma= 0.9 and that wear normally distributed. Test H0:mu=3 versus H1 mu <>3 using alpha 0.05
Did you reject the null hypothesis? Ans yes or no Blank 1
The power of this test(as a percent with two decimal place precision) for H1: mu=3.25 is Blank 2
What minimum sample size (as an integer) would be required to reject the null hypothesis if H1: mu=3.25? Blank 3