Minitab - Assignment Example

Assignment In June of 2009, a Pew Poll asked 1005 randomly selected people: Which over-the-counter drug do doctors recommend to help prevent heart attacks? Is it aspirin, cortisone, or antacids? (Options were rotated.) Of 1005, 914 correctly chose aspirin. Determine a 95% confidence interval for the population proportion who knew the correct answer. SOLUTIONWe sought to determine a 95% confidence interval for the population proportion who knew the correct answerAssumptions;Before we decide on the test to use, we make the following assumptions;Random sampling from a defined population Interval or ratio scale of measurement Population is normally distributedTest and CI for One Proportion: Correct drugTest of p = 0.

5 vs p not = 0.5Event = 1Variable X N Sample p 95% CI Z-Value P-ValueCorrect drug 914 1005 0.9095 (0.8902, 0.9257) 36.714 0.000The p-value is given as 0.000 (a value less than α=0.05); we thus reject the null hypothesis and conclude that there is significant difference in the proportion of those who gave the right answers and those that gave wrong answers. The Z-Score is 36.714. The p-value is 0.000. The result is significant at p