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Creating a formula that modifies itself based on number of samples.

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    Creating a formula that modifies itself based on number of samples.

    I am trying to create a form that peforms 95% UCL statistical analysis for a varying number of sample points. I am trying to create a spreadsheet that will put the proper Student T in the formula. I have already created a form that works but only if you select the correct form for the number of samples that you collected.

    For example:
    If 6 samples are taken then the formula is =(A35+2*(A44/SQRT(6)))
    If 3 samples are taken then the formula is =(A35+2.9*(A39/SQRT(3)))

    If i make A1 a cell that gives me the number of samples (between 2 and 9) how can i get the formulas above to insert the correct Student T?

    The Student T Chart for the number of samples is as Follows:
    2=6.3
    3=2.9
    4=2.4
    5=2.1
    6=2.0
    7thru 9=1.9

    I am using Excel 2000 if that matters.

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    Forum Expert ConneXionLost's Avatar
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    Re: Creating a formula that modifies itself based on number of samples.

    Hi tdurton,

    If you add your Student T Chart to another worksheet, you'll be able to use the LOOKUP function in place of the student T in your formula.

    Cheers,
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    Administrator JBeaucaire's Avatar
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    Re: Creating a formula that modifies itself based on number of samples.

    Quote Originally Posted by tdurton View Post
    If 6 samples are taken then the formula is =(A35+2*(A44/SQRT(6)))
    If 3 samples are taken then the formula is =(A35+2.9*(A39/SQRT(3)))

    If i make A1 a cell that gives me the number of samples (between 2 and 9) how can i get the formulas above to insert the correct Student T?

    The Student T Chart for the number of samples is as Follows:
    2=6.3
    3=2.9
    4=2.4
    5=2.1
    6=2.0
    7thru 9=1.9
    This formula converts your table above into a formula:
    =LOOKUP(A1, {2,3,4,5,6,7}, {6.3,2.9,2.4,2.1,2,1.9})

    This inserts it into the original formula:
    =(A35 + LOOKUP(A1, {2,3,4,5,6,7}, {6.3,2.9,2.4,2.1,2,1.9}) * (A44 / SQRT(A1)))
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