urce. A stock analyst believes that the stock volume in 2018 is different from ed on a random sample of 30 trading days in 2018, he finds the sample mean n shares, with a standard deviation of s = 11.7 million shares. Test the hypoth ng a 95% confidence interval. Complete parts (a) through (c) below. uct a 95% confidence interval about the sample mean of stocks traded in 201 confidence, the mean stock volume in 2018 is between ares. three decimal places as needed.) million shares and