(Answered) Statistics assignment due in 10 hours please helpin a pulse

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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.

(d) Is there sufficient evidence to support the researcher's claim. Explain.

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