A random sample of 76 percentage changes in promised health benefits was observed. The sample mean percentage change was 0.078 and the sample standard deviation 0.201. Find and interpret the p value of a test of the null hypothesis that the population mean percentage change is 0 against a 2 sided alternative.
I am stuck. I get the value (0.078-0) /(0.201/ sqroot 76) = 3.38 but then I a not able to find this number in the table of the book because it ends at 0.005 for alfa. And anyway after I get that alfa how to go on?
I seriously need your help to get over this course. Thank you so so much. Seriously.
as set which indicates what is appropriate, so we choose 5% because
that's what everyone does when they have no idea.
YesSo you mean 2* |P-value|> alfa we accept; inside we reject. Since 0.008 falls inside -0.025;+ 0.025 we reject?