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Math Help - Test means after a variable (effect) has been removed

  1. #1
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    Test means after a variable (effect) has been removed

    Hey, I'm a little stuck trying to wrap my head around this. It's in my textbook with no answer key and it's really bugging me!

    My issue is that when it says to remove age information does that mean degrees of freedom are lost? Wondering how this affects the final answer.

    imgur: the simple image sharer

    Thanks for the help. I'll be quick to reply and try to work this out.
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  2. #2
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    Re: Test means after a variable (effect) has been removed

    Hi sharper44

    I can't access your image but is your question about confidence intervals?

    In general if you remove samples your degrees of freedom will be smaller and making an interval bigger.
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