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Unformatted text preview: a. For samples of size 55, what are the mean and standard deviation of the sampling distribution of sample means? (4 pts.) b. For a sample of size 55, what is the probability that the sample mean high school grade point average is higher than 3.49? (4 pts.) c. For a sample of size 55, what is the probability that the sample mean high school grade point average is lower than 3.34? (4 pts.) 4. A computer company claims that 60% of college students prefer their line of laptops. A consumer advocacy group believes the claim is wrong and that the true proportion of students preferring that brand of computer is less than 60%. A survey shows that 300 out of 560 randomly chosen dentists prefer that brand of toothpaste. Test the claims using an = 0.05 level of significance. (25 pts.) Assumptions Hypotheses Test Statistic Pvalue Conclusions...
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 Fall '07
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