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Thread: Confidence Interval

  1. #1
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    Exclamation Confidence Interval

    Hello Everyone,

    This is my first time posting. I'm working on a statistics problem that I'm having difficulty understanding. Here is the problem:

    The Praxis II test was given to a sample of 1573 prospective teachers. The mean of these scores was 1053 and the standard deviation was 92.
    a.) Give a 95% confidence interval (μ 2ơ) for the mean (average) score in the population of all young women.
    b.) Suppose that a sample of 300 prospective teachers had produced the same mean and standard deviation. Again, give the 95% confidence interval (μ 2ơ) for the mean (average) score in this case.

    I have gone over and over but I'm not understanding something because it feels like information is missing based on what I have been doing. I appreciate any help with understanding the problem.
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  2. #2
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    Quote Originally Posted by pbball View Post
    Hello Everyone,

    This is my first time posting. I'm working on a statistics problem that I'm having difficulty understanding. Here is the problem:

    The Praxis II test was given to a sample of 1573 prospective teachers. The mean of these scores was 1053 and the standard deviation was 92.
    a.) Give a 95% confidence interval (μ 2ơ) for the mean (average) score in the population of all young women.
    b.) Suppose that a sample of 300 prospective teachers had produced the same mean and standard deviation. Again, give the 95% confidence interval (μ 2ơ) for the mean (average) score in this case.

    I have gone over and over but I'm not understanding something because it feels like information is missing based on what I have been doing. I appreciate any help with understanding the problem.
    You will find several worked examples of this type of question on these boards.

    In both cases you have the values of n, $\displaystyle \overline{x}$ and $\displaystyle s_x$. You only have to decide whether to use the t- or z-statistic.

    Why do you think there is missing information? Where exactly are you stuck?
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