DDT poisoning. In a randomized comparative experiment, researcherscompared 6 white rats

Chapter 0, Problem 19.13

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DDT poisoning. In a randomized comparative experiment, researcherscompared 6 white rats poisoned with DDT with a control group of 6 unpoisonedrats. Electrical measurements of nerve activity are the main clue to the nature ofDDT poisoning. When a nerve is stimulated, its electrical response shows a sharpspike followed by a much smaller second spike. The experiment found that thesecond spike is larger in rats fed DDT than in normal rats.9The researchers measured the height of the second spike as a percent of thefirst spike when a nerve in the rats leg was stimulated. Here are the results: Figure 19.5 shows the CrunchIt! output for the two-sample t test. What are xiand si for the two samples? Starting from these values, find the t test statistic andits degrees of freedom. Your work should agree with Figure 19.5.

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