Researchers are interested in evaluating the effect of a natural product on reducing blood pressure. This will be done by comparing the mean reduction in blood pressure of a treatment (natural product) group and a placebo group using a two-sample t-test. The researchers would like to be able to detect whether the natural product reduces blood pressure by at least 7 points more, on average than the placebo. If groups of size 50 are used in the experiment, a two-sample t-test using alpha=0.01 will have a power of 80 % to detect a 7 -point difference in mean blood pressure reduction. If the researchers want to be able to detect a 5 -point difference instead, then the power of test (a) would be less than 80 %. (b) would be greater than 80 %. (c) would still be 80 %. (d) could be either less than or greater than 80 %, depending on whether the natural product is effective. (e) would vary depending on the standard deviation of the data. need explanation for incorrect answer
Researchers are interested in evaluating the effect of a natural product on reducing blood pressure. This will be done by comparing the mean reduction in blood pressure of a treatment (natural product) group and a placebo group using a two-sample t-test. The researchers would like to be able to detect whether the natural product reduces blood pressure by at least 7 points more, on average than the placebo. If groups of size 50 are used in the experiment, a two-sample t-test using alpha=0.01 will have a power of 80 % to detect a 7 -point difference in mean blood pressure reduction. If the researchers want to be able to detect a 5 -point difference instead, then the power of test
(a) would be less than 80 %.
(b) would be greater than 80 %.
(c) would still be 80 %.
(d) could be either less than or greater than 80 %, depending on whether the natural product is effective.
(e) would vary depending on the standard deviation of the data.
need explanation for incorrect answer
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