The assignment should be done using R statistical software. No manual calculations are allowed Please turn in all codes and corresponding outputs The assignment should be typed in.

Two investigators at two different study centers conducted a clinical trial to determine the effect of two doses of a new therapeutic agent on short-term memory function. A single oral dose of the test preparation was administered to subjects, who were then asked to recall items one hour after exposure to a list consisting of 15 items. The number of items correctly identified are shown in "Memory.txt". A placebo group was included as a control in a parallel-group design. Propose a suitable design and test for the effects of different doses. Make sure to include the effect of study center in your analysis. Your report should include all the necessary steps involved in carrying out the above test, your findings, and conclusions and/or recommendations.

Items Dose Center 6 PLACEBO ABEL 5 PLACEBO ABEL 6 PLACEBO ABEL 8 PLACEBO ABEL 3 PLACEBO ABEL 4 PLACEBO ABEL 5 PLACEBO ABEL 6 PLACEBO ABEL 5 PLACEBO ABEL 5 PLACEBO ABEL 7 PLACEBO ABEL 8 PLACEBO ABEL 7 PLACEBO BEST 4 PLACEBO BEST 7 PLACEBO BEST 6 PLACEBO BEST 7 PLACEBO BEST 8 PLACEBO BEST 5 PLACEBO BEST 9 PLACEBO BEST 11 PLACEBO BEST 4 PLACEBO BEST 7 PLACEBO BEST 8 LOW ABEL 12 LOW ABEL 7 LOW ABEL 8 LOW ABEL 6 LOW ABEL 9 LOW ABEL 6 LOW ABEL 11 LOW ABEL 5 LOW BEST 6 LOW BEST 6 LOW BEST 5 LOW BEST 3 LOW BEST 8 LOW BEST 6 LOW BEST 9 LOW BEST 11 LOW BEST 5 LOW BEST 11 HIGH ABEL 7 HIGH ABEL 7 HIGH ABEL 11 HIGH ABEL 9 HIGH ABEL 10 HIGH ABEL 12 HIGH ABEL 9 HIGH ABEL 15 HIGH ABEL 9 HIGH BEST 12 HIGH BEST 13 HIGH BEST 9 HIGH BEST 13 HIGH BEST 12 HIGH BEST 14 HIGH BEST 15 HIGH BEST 12 HIGH BEST