In The Previous Problem A Randomized Double Blind Experiment Was Done To Test The Effectiveness Of A Drug Designed To I 1 (44.98 KiB) Viewed 55 times
In The Previous Problem A Randomized Double Blind Experiment Was Done To Test The Effectiveness Of A Drug Designed To I 2 (47.63 KiB) Viewed 55 times
In the previous problem, a randomized double-blind experiment was done to test the effectiveness of a drug designed to improve memory in Alzheimer's patient. Suppose the experiment was repeated and a 3rd group was added, no drug or placebo. Placebo group: Here's the results: Drug group: 1, 9, 0, 3 -2, 5, 0 Nothing group: 0, 2, 1 Null Hypothesis: No difference between any of the groups in the population Alternative Hypothesis: At least one of the groups is different in the population a. Fill out the chart below: First combine into one ordered list: -2, 0, 0, 0, 1, 1, 2, 3, 5, 9 Observed Rank Sum Exp 22. 33.5 Drug Submit Answer group Incorrect. Tries 1/3: Placebo Group Submit Answer Incorrect. Tries 1/3 12.5 Nothing group Submit Answer Incorrect. Tries 1/3 access5.lon-capa.illinois.edu - Private Previous Tries Previous Tries Previous Tries Co ar sh Yo сс YC is 16.5 Co ar st Yo CC YC is 16.5 Co ar sh Yo Сс YC is
12 (obsR;-expR;)² b. Find H= N(N+1) ni i=1 Submit Answer Tries 0/4 c. Since the samples sizes are small, what test-statistic can we use to compute p-values? Use the H stat and look up its exact probability distribution on tables O Use the H stat but look up the critical values on the F curves Use the H stat but look up the critical values on the Chi Square curves with df=g-1 Submit Answer Tries 0/2 d. Let's assume the sample sizes were large enough so we can approximate the H stat with the Chi square curves. To find p-value, look at the Chi square curve with degree of freedom. Submit Answer Tries 0/2 What is the critical value of chi-square at a = 0.05? Submit Answer Tries 0/2 Reject the null hypothesis Fail to reject the null hypothesis What do you conclude?
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