You may need to use the appropriate appendir tatile or lechnologr to antwer this question. A simple ravidom sample of 70 items resulted in a sample mean of 90 . The population standard deviation is o =15. (a) Compute the 9546 confidence interval for the poputation mesh. (Round your answers to two decimsi places.) to ansmers to tro decimal places.) to (c) What is the effect of a larger sample sue on the interval estimate? A larger sampie size provides a larger margin of error. A larger sample tive does not change the margin of error. A larger sample sire provides a smaller margin of error