STATISTICS ASSIGNMENT DUE IN 10 HOURS, PLEASE HELP.
In a pulse rate research, a simple random sample of 625 men results in a mean of 80 beats per minute, and a standard deviation of 11.5 beats per minute. Based on the sample results, the researcher concludes that the pulse rates of men have a standard deviation less than 12 beats per minutes. Use a 0.05 significance level to test the researcher's claim.
(a) Identify the null hypothesis and alternative hypothesis.
(b) Determine the test statistic. Show work.
(c) Determine the P-value for this test. Show work.
(d) Is there sufficient evidence to support the researcher's claim. Explain.