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    tanisharouse Posts: 1, Reputation: 1
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    Feb 9, 2013, 09:02 PM
    need help with my statistics homework
    A researcher is interested in whether students who attend private high schools have higher average SAT Scores than students in the general population. A random sample of 90 students at a private high school is tested and a mean SAT score of 1030 is obtained. The average score for public high school student is 1000 (σ= 200).
    a. Is this a one- or two tailed test?

    b. What are H0 and Ha for this study?

    c. Compute Z obt

    d. What is the Z critical value (Z cv ) using a 0.05 alpha level?

    e. Should H0 be rejected? What should the researcher conclude?

    f. Determine the 95 % confidence interval for the population mean, based on the sample mean.

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