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    Confidence Intervals

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    Random sampling from two normal populations produced the following results:
    Xbar1= 63, s1= 18 n1=50
    xbar2= 60 s2 = 7 n2 = 45
    a. Estimate with 90% confidence the difference between the two population means.
    b. Repeat part a changing the sample standard deviations to 41 and 15 respectively.
    c. What happens when the sample standard deviations increase?
    d. Repeat part a doubling the sample size.
    e. Describe the effects of increasing the sample sizes.

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    Solution Preview

    Problem:
    Random sampling from two normal populations produced the following results:
    Xbar1= 63, s1= 18 n1=50
    xbar2= 60 s2 = 7 n2 = 45
    a. Estimate with 90% confidence the difference between the ...

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