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Unformatted text preview: 4. For a normal distribution, what z-score value separates the lowest 25% of the distribution from the highest 75%? __________________ 1 5. What proportion of a normal distribution falls between z = -.75 and z = +.75? __________________ 6. A random sample of n = 64 scores is obtained from a normal population with μ = 100 and ơ = 16. What is the probability of obtaining a mean less than M = 95 for this sample? __________________ 7. A treatment is administered to a sample selected from a population with a mean of μ = 1500 and a standard deviation of ơ = 12. After treatment, the sample mean is M = 1450. Based on this information, the effect size as measured by Cohen's d is __________. 8. A population is known to have a mean of μ = -1.00. If a researcher predicts that the experimental treatment will produce an increase in the population mean, then the null and alternative hypotheses for a one-tailed test would state __________. 2...
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- Spring '07