# Question

Swim maze study. Merck Research Labs used the single-T swim maze to conduct an experiment to evaluate the effect of a new drug. Nineteen impregnated dam rats were allocated a dosage of 12.5 milligrams of the drug. One male and one female rat pup were randomly selected from each resulting litter to perform in the swim maze. Each pup was placed in the water at one end of the maze and allowed to swim until it escaped at the opposite end. If the pup failed to escape after a certain period of time, it was placed at the beginning of the maze and given another chance. The experiment was repeated until each pup accomplished three successful escapes. The accompanying table (saved in the RATPUPS file) reports the number of swims required by each pup to perform three successful escapes. Is there sufficient evidence of a difference between the mean number of swims required by male and female pups? Conduct the test (at α = .10). Comment on the assumptions required for the test to be valid.

## Answer to relevant Questions

For each of the following studies, give the parameter of interest and state any assumptions that are necessary for the inferences to be invalid. a. To investigate a possible link between jet lag and memory impairment, a ...To use the t-statistic to test for a difference between the means of two populations, what assumptions must be made about the two populations? About the two samples? The Ohio Environmental Protection Agency used the Index of Biotic Integrity (IBI) to measure the biological condition, or “health,” of an aquatic region. The IBI is the sum of metrics that measure the presence, ...A paired difference experiment produced the following data: a. Determine the values of t for which the null hypothesis µ1 - µ2 = 0 would be rejected in favor of the alternative hypothesis µ1 - µ2 < 0. Use α = .10. b. ...What are the treatments for a designed study with two factors, one qualitative with two levels (A and B) and one quantitative with five levels (50, 60, 70, 80, and 90)?Post your question

0