The mean age of the 43 presidents of the United States (as of 2011) on the day of inauguration is 54.6 years, with a standard deviation of 6.3 years. A researcher constructed a 95% conﬁdence interval for the mean age of presidents on inauguration day. He wrote that he was 95% conﬁdent that the mean age of the president on inauguration day is between 52.7 and 56.5 years of age. Is there anything wrong with the
Answer to relevant QuestionsPopulation A has standard deviation σA = 5, and population B has standard deviation σB = 10. How many times larger than Population A’s sample size does Population B’s need to be to estimate mwith the same margin of ...A simple random sample of size n = 40 is drawn from a population. The sample mean is found to be x̄ = 120.5, and the sample standard deviation is found to be s = 12.9. Construct a 99% conﬁdence interval for the population ...In a random sample of 40 visitors to a certain theme park,it was determined that the mean amount of money spent per person at the park (including ticket price) was $93.43 per day with a standard deviation of $15. Construct ...Test the hypothesis at the α = 0.05 level of signiﬁcance, using (a) the classical approach and (b) the P-value approach. Be sure to verify the requirements of the test. H0: p = 0.6 versus H1: p > 0.6 n = 250; x = 165 Explain the difference between “accepting” and “not rejecting” a null hypothesis.
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