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Math Help - calculating a test statistic

  1. #1
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    calculating a test statistic

    Hi all I'm confused on calculating a test statistic. I am doing "hypothesis testing using t-scores" and my sample size is 100, sample mean 24.6, sample std. dev. 7.25. I have to decide if the population mean is significantly greater than 23 at the 0.05 level. If my df=100-1=99, do I use the df in my Student t chart with the infinity symbol? I guess I am confused because there is a df listing for 120, but not 100.
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    Quote Originally Posted by peanutbutter View Post
    Hi all I'm confused on calculating a test statistic. I am doing "hypothesis testing using t-scores" and my sample size is 100, sample mean 24.6, sample std. dev. 7.25. I have to decide if the population mean is significantly greater than 23 at the 0.05 level. If my df=100-1=99, do I use the df in my Student t chart with the infinity symbol? I guess I am confused because there is a df listing for 120, but not 100.
    You should use the listing for df = 120.

    As you can see from the table at http://shazam.econ.ubc.ca/intro/critval.htmi it probably won't affect the conclusion you come to.
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