Question

9 Six capsules of drug A took an average of 75 seconds with standard deviation of 1.4 seconds to dissolve, while the average time for six capsules of drug B was 71 seconds with standard deviation of 1.7 seconds. Establish a 99% confidence interval estimate for the difference in dissolving time between the two brands. What is the interval, rounded to two decimal places? (2.45, 5.55) (1.52, 6.48) (1.44, 6.56) (1.13, 6.87) (1.15, 6.85)

Answer 1

9 Six capsules of drug A took an average of 75 seconds with standard deviation of 1.4 seconds to dissolve, while the average time for six capsules of drug B was 71 seconds with standard deviation of 1.7 seconds. Establish a 99% confidence interval estimate for the difference in dissolving time between the two brands. What is the interval, rounded to two decimal places? (2.45, 5.55) (1.52, 6.48) (1.44, 6.56) (1.13, 6.87) (1.15, 6.85)

10 Refer to your answer in problem 9. Suppose you conduct a test of significance at the .01 level with null hypothesis that the two drugs required the same amount of time to dissolve against a two-sided alternative. What would your conclusion be? 2 Reject null hypothesis; the test does not provide convincing evidence that the two drugs have different dissolving times. Reject null hypothesis; the test provides convincing evidence that the two drugs have different dissolving times. Accept null hypothesis: the test does not provide convincing evidence that the two drugs have different dissolving times. Fail to reject null hypothesis; the test does not provide convincing evidence that the two drugs have different dissolving times. Cannot answer question because a confidence interval has no relation to a two-sided test of significance.

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