Foofy computes the correlation between an individual’s physical strength and his or her college grade point average. Using a computer, the correlation for a sample of 2000 people is r(1998) = + .08, p = < .0001. She claims this is a useful tool for predicting which college applicants are likely to succeed academically. Do you agree or disagree? Why?
Answer to relevant QuestionsWe study the influence of wearing uniforms in middle school on attitudes toward achieving good grades. On a national survey, the average attitude score for students who do not wear uniforms is µ = 12. A sample of students ...You wish to compute the 95% confidence interval for a sample with a df of 80. Using interpolation, determine the tcrit that you should use. (a) What is the difference between SX and σX? (b) How is their use the same? (a) What is the final step when completing an experiment? (b) Why is effect size useful at this stage? With a = .05 and df = 40, a significant independent-samples tobt was +4.55. How would you report this in the literature?
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