Question

The average daily volume of a computer stock in 2011 was mu equals35.1 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 40 trading days in​ 2014, he finds the sample mean to be 27.3 million​ shares, with a standard deviation of s= 12.2 million shares. Test the hypotheses by constructing a 95 ​% confidence interval. Complete parts​ (a) through​ (c) below.

(a) State the hypotheses for the test.

​(b) Construct a 95​% confidence interval about the sample mean of stocks traded in 2014. (Round to three decimal places as​ needed.)

​(c) Will the researcher reject the null​ hypothesis?

Answer 1