Question 1 We considered the differences between the temperature readings in January 1 of 1968 and 2008 at 51 locations in the continental US in Exercise 5.19. The mean and standard deviation of the reported differences are 1.1 degrees and 4.9 degrees respectively. (a) Calculate a 90% confidence interval for the average difference between the temperature measurements between 1968 and 2008. lower bound: degrees(please round to two decimal places) upper bound: degrees(please round to two decimal places) (previous answer given by expert of Lower bound= -0.028 Upper bound=2.228 Was marked incorrect) Question 2 You wish to test the following claim (Ha) at a significance level of α=0.005 Ho:p1=p2 Ha:p1>p2 You obtain 19.3% successes in a sample of size n1=445 from the first population. You obtain 12.8% successes in a sample of size n2=775 from the second population. For this test, you should NOT use the continuity correction, and you should use the normal distribution as an approximation for the binomial distribution. What is the test statistic for this sample? (Report answer accurate to three decimal places.) test statistic = What is the p-value for this sample? (Report answer accurate to four decimal places.) p-value = (previous answers given by an expert of test statistic Z = 3.004 and P-value = .001 were both marked wrong)
Question 1
We considered the differences between the temperature readings in January 1 of 1968 and 2008 at 51 locations in the continental US in Exercise 5.19. The mean and standard deviation of the reported differences are 1.1 degrees and 4.9 degrees respectively.
(a) Calculate a 90% confidence interval for the average difference between the temperature measurements between 1968 and 2008.
lower bound: degrees(please round to two decimal places)
upper bound: degrees(please round to two decimal places)
(previous answer given by expert of Lower bound= -0.028 Upper bound=2.228 Was marked incorrect)
Question 2
You wish to test the following claim (Ha) at a significance level of α=0.005
Ho:p1=p2
Ha:p1>p2
You obtain 19.3% successes in a sample of size n1=445 from the first population. You obtain 12.8% successes in a sample of size n2=775 from the second population. For this test, you should NOT use the continuity correction, and you should use the
What is the test statistic for this sample? (Report answer accurate to three decimal places.)
test statistic =
What is the p-value for this sample? (Report answer accurate to four decimal places.)
p-value =
(previous answers given by an expert of test statistic Z = 3.004 and P-value = .001 were both marked wrong)
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