Question

For ALL problems, state hypotheses, in words and symbols and give me everything listed below. Use SPSS when appropriate but DO NOT print out and turn in SPSS output.  Instead, just read the critical information out of SPSS and report: obtained t-statistic, probability of obtaining that statistic under the null (p-value), decision to reject null or not, interpretation of results in words, and report measure of effect size if appropriate.

1. I want to know if rats with an exercise wheel in their cages end up healthier (less chubby) than rats without.  I know the average weight of rats without exercise wheels is 402 grams.  I take 10 rats and put an exercise wheel in their cages.  Then after a month, I weigh them and get these weights in grams:

Wheel group: 320, 240, 400, 390, 270, 300, 320, 409, 380, 460

2. I want to know if wall color affects test scores.  I randomly assign 5 students to either the blue wall group or the red wall group.  The blue group gets test scores of 87, 99, 76, 87, 80 while the red wall group gets 88, 85, 90, 76, 87.

Answer 1

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