The average daily volume of a computer stock in 2011 was u = 35.1 million shares, according to a reliable source. A stock analyst believes that the stock volume in 2018 is different from the 2011 level. Based on a random sample of 30 trading days in 2018, he finds the sample mean to be 31.2 million shares, with a standard deviation of s = 12.4 million shares. Test the hypotheses by constructing a 95% confidence interval. Complete parts (a) through (c) below. (a) State the hypotheses for the test. Ho: H = 35.1 million shares H4: H # 35.1 million shares (b) Construct a 95% confidence interval about the sample mean of stocks traded in 2018. With 95% confidence, the mean stock volume in 2018 is between million shares and million shares. (Round to three decimal places as needed.) (c) Will the researcher reject the null hypothesis? O A. Reject the null hypothesis because u = 35.1 million shares does not fall in the confidence interval. O B. Reject the null hypothesis because u = 35.1 million shares falls in the confidence interval. OC. Do not reject the null hypothesis because u = 35.1 million shares falls in the confidence interval. O D. Do not reject the null hypothesis because µ= 35.1 million shares does not fall in the confidence interval.

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