Question 1. use the data above to construct a 95% confidence interval for the mean class size μ. (calculate y and s to 3 decimal places). lower bound of confidence interval upper bound of confidence interval question 2. mark the following statement as true or false: the probability is 0.95 that the mean size μ of high school classes is contained in the interval calculated above. one submission only; no exceptions. true false

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.