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STATS - A computer systems retailer wishes to compare the average monthly sales

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Question;A computer systems retailer wishes to compare the average monthly sales of its servers with Intel and AMD multi-core processors. To do so, they record the number of sales of each server type for each of the last 12 months:Month Intel AMDJan 900 840Feb 720 700Mar 660 600Apr 700 680May 900 840Jun 860 920Jul 760 740Aug 1100 1080Sep 1380 1280Oct 920 860Nov 880 820Dec 780 780a) For this dataset, why should the company use a paired difference analysis instead of an independent samples analysis?b) Compute the 95% confidence interval for the average monthly sales of each server type (?1,?2).c) Compute the 95% confidence interval for the difference in monthly sales?1??2.d) Notice that the confidence intervals in part b overlap, but the confidence interval in part c does not contain?1??2 = 0. Explain the discrepancy between these two results. Which result is a better indicator of whether or not?1 and?2 are likely to be identical?e) Is the sample evidence sufficient to conclude whether?1 and?2 are different? To answer this question, perform a hypothesis test at? =.05. You should state the alternative and null hypotheses, compare the observed t-score to the t-score threshold, estimate the p-value, and state the conclusion of the test.

 

Paper#62229 | Written in 18-Jul-2015

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