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Thread: Calculating test stats from hypothesis (easy question, but O completely confused)

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    Calculating test stats from hypothesis (easy question, but O completely confused)




    Hello,
    I am trying to complete what seems to be an easy problem, but I am stumped.

    Using the theory (null hypothesis) that a genetic trait is produced p=.25
    Using random sampling of 100 crosses, the trait is produced p=.31

    (I believe null hyp is H0= p=.25; ha= p>.25)

    What is the test statistic?

    All our notes use the formula: T-stat= (sample mean-expected mean)/(sample standard dev/ sqrt(sample size))
    but I don't know how to come up with the standard deviation.

    Thank you!

    (In a previous example in the powerpoint: normal cholesterol levels= 225. a study with 43 subjects yielded a mean cholesterol level of 237.98. And then it says sample SD= 38.54. I'm not sure if he is saying he found the sample SD or it was known. If he calculated it, I have no idea how.
    Last edited by dorothy8; 03-05-2017 at 02:55 PM.

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    Re: Calculating test stats from hypothesis (easy question, but O completely confused)


    google "large sample test of hypothesis about a population proportion"

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