A study was initiated to investigate the effect of two drugs, administered simul

Question

A study was initiated to investigate the effect of two drugs, administered simultaneously, on reducing human blood pressure. It was decided to use three levels of each drug and to include all nine combinations in the experiment. Nine high-blood-pressure patients were selected for the experiment, and one was randomly assigned to each of the nine drug combinations. The response observed was a drop in blood pressure over a fixed interval of time. Now Suppose that a balanced completely randomized design is to be employed and that prior experimentation suggests that sigma = 20.

c) Give the approximate half-width of a 95% confidence interval for the difference in mean responses for two treatments when using the number of replications determined in part (a).
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Explanation / Answer

half width of a confidence interval is also known as the margin of error.
for a 95% confidence interval it is = 0.98/N = 0.98/15 = 0.253

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