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Math Help - Statistics: Hypothesis Testing Q

  1. #1
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    Statistics: Hypothesis Testing Q

    I'm confused on how I should go about creating the hypothesis for the population. Lets say there are n = 5 people and they are tested to see how long their nails are. These values are z scores (I made these values up and it's in cm): 1.30, 2.25, 2.60, 1.10, and 3.05. My z-critical will be p<0.05 on a two tail.

    By this data, I reject the null hypothesis because most of them are above 1.96. But how would I do this calculation using the formula:
    mean - hypothesized population mean / standard error?

    I don't understand how to obtain the mean, standard deviation, and I'm not sure what I should hypothesize for the population mean. Someone please show me step by step on how to solve this. Thank you.
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  2. #2
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    Quote Originally Posted by Catdaddy View Post
    I'm confused on how I should go about creating the hypothesis for the population. Lets say there are n = 5 people and they are tested to see how long their nails are. These values are z scores (I made these values up and it's in cm): 1.30, 2.25, 2.60, 1.10, and 3.05. My z-critical will be p<0.05 on a two tail.

    By this data, I reject the null hypothesis because most of them are above 1.96. But how would I do this calculation using the formula:
    mean - hypothesized population mean / standard error?

    I don't understand how to obtain the mean, standard deviation, and I'm not sure what I should hypothesize for the population mean. Someone please show me step by step on how to solve this. Thank you.
    Please type the exact question.

    CB
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  3. #3
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    I'm sorry there is no question, it's just a graph with nail sizes. I don't get how I'm supposed to obtain these values with just this information. Am I missing something here?
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  4. #4
    Grand Panjandrum
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    Quote Originally Posted by Catdaddy View Post
    I'm sorry there is no question, it's just a graph with nail sizes. I don't get how I'm supposed to obtain these values with just this information. Am I missing something here?
    OK ... then what are you trying to do? Why do you want to do some kind of test on this data ...

    CB
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