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A random sample of n 16 scores is obtained from a population with a mean of 45. After a treatment is administered to the individuals in the sample, the sample mean is found to be M 49.2.
a. Assuming that the sample standard deviation is s 8, compute r 2 and the estimated Cohen's d to measure the size of the treatment effect.
b. Assuming that the sample standard deviation is s 20, compute r 2 and the estimated Cohen's d to measure the size of the treatment effect.
c. Comparing your answers from parts a and b, how does the variability of the scores in the sample influence the measures of effect size?
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In recent year, of the 109,857 arrest fro federal offenses, 29.1% were for drug offenses. Use a .01 significance level to test the claim that the drug offense rate is equal to 30%.
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Assume a normal population. Using the .05 significance level, can we conclude the mean is different from 100?
If p denotes the p -value of the corresponding hypothesis test, which of the following is true?
Compare the computed linear correlation coefficient r to the critical value of r at the 5% significance level to determine whether there is a linear correlation between the two characteristics. Does the slope of the regression line appear to indic..
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