Problem solving statistic

1-A random sample of Ohio cemeteries shows that the average age at death of Revolutionary War veterans is 67 years (n = 28, s = 9). Another such random sample showed that the average age at death for Civil War veterans who survived the war is 48 years (n = 77, s = 12). Find the 95% confidence interval estimating the population difference between the age at death of these two groups of veterans assuming not equal variances.

2-A group of 26 patients scored 45.3 on a particular medical test after using an experimental drug, with a standard deviation of 5.8. A control group of patients administered a placebo scored 49.7 on the same test. Set up a hypothesis test to compare the experimental group with the control group. Perform the hypothesis test and interpret the results.

Sample Solution

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