Question

The average daily volume of a computer stock in 2011 was mu equals 35.1 million​ shares, according to a reliable source. A stock analyst believes that the stock volume in 2014 is different from the 2011 level. Based on a random sample of 30 trading days in​ 2014, he finds the sample mean to be 29.9 million​ shares, with a standard deviation of s equals 14.5 million shares. Test the hypotheses by constructing a 95​% confidence interval.

(b) Construct a 95​% confidence interval about the sample mean of stocks traded in 2014.

The lower bound is _____ million shares.

The upper bound is _____ million shares.

Answer 1

Here using ti-83 calculator.

95% confidence interval about the sample mean of stocks traded in 2014 is

The lower bound is 24.486 million shares.

The upper bound is 35.314 million shares.