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Math Help - Z- statistics? and how to calculate

  1. #1
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    Z- statistics? and how to calculate

    We have a random sample of 200 something
    with a sample average = 21
    and standard deviation = 10

    Can we say that the population average is greater then 14?

    If we test with a signifance level = 0.01 then what value has the test statistics?

    This is my thinking, because we have n>30, then we have to use the z - test?

    I am calculating the value of test statistics for about 1 hour and still it's incorrect!
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  2. #2
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    Re: Z- statistics? and how to calculate

    Quote Originally Posted by Nforce View Post
    We have a random sample of 200 something
    with a sample average = 21
    and standard deviation = 10

    Can we say that the population average is greater then 14?

    If we test with a signifance level = 0.01 then what value has the test statistics?

    This is my thinking, because we have n>30, then we have to use the z - test?

    I am calculating the value of test statistics for about 1 hour and still it's incorrect!
    Yes, the z-test can be used. Follow the examples in your textbook and class notes. If you need more help, please show all your work and say where you get stuck.
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