Hello, I just need help with these few statistics questions. Thank You.

16. The average daily volume of a computer stock in 2000 was =31.8millionshares, with a standard deviation of =15.4millionshares, according to a reliable source. A stock analyst believes that the stock volume in 2004 is different from the 2000 level. Based on a random sample of 40trading days in2004, he finds the sample mean to be 22.9million shares. Test the hypotheses by constructing a 95%confidence interval.

What is the confidenceinterval?(_____ million shares, ______ million shares)

(Use ascending order. Round to two decimal places as needed.)

14.To testH0: =20 versus H1: <20, a random sample of size n=18 is obtained from a population that is known to be normally distributed with =3.

(a) If the sample mean is determined to be x=18.6, compute theP-value.

(b) If the researcher decides to test this hypothesis at the =0.05 level ofsignificance, will the researcher reject the nullhypothesis? (a) Compute theP-value. nothing (Round to four decimal places asneeded.)

13. To testH0:=100 versusH1: 100, a random sample of size n=26 is obtained from a population that is known to be normally distributed with =8. (a) If the sample mean is determined to be x=104.8, compute the test statistic.

________ (Round to two decimal places asneeded.)

12. To test H0: =60 versus H1: <60, a random sample of size n=28 is obtained from a population that is known to be normally distributed with =14. (a) If the sample mean is determined to be x=57.3, compute the test statistic.

________ (Round to two decimal places asneeded.)