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P value calculation

  • 20-02-2006 08:10PM
    #1
    AngryBadger
    Closed Accounts Posts: 3,251 ✭✭✭


    Apologies if this question is particularly stupid. I'm trying to use a T-test to validate/support some conclusions I've drawn based on the experimental data I have. I can't figure out how to calculate the P-value once I've worked out the "t" statistic.

    I'm obviously missing something simple, but it also seems like the relevance of the P-value is totally arbitrary?

    Thanks in advance for any help.


Comments

  • #2
    GuanYin
    Closed Accounts Posts: 15,552 ✭✭✭✭GuanYin


    AngryBadger wrote:
    Apologies if this question is particularly stupid. I'm trying to use a T-test to validate/support some conclusions I've drawn based on the experimental data I have. I can't figure out how to calculate the P-value once I've worked out the "t" statistic.

    I'm obviously missing something simple, but it also seems like the relevance of the P-value is totally arbitrary?

    Thanks in advance for any help.

    You don't calculate P values, you look them up on a statistics table, or use a calculator.


  • #3
    AngryBadger
    Closed Accounts Posts: 3,251 ✭✭✭AngryBadger


    psi wrote:
    You don't calculate P values, you look them up on a statistics table, or use a calculator.

    As I said something simple :p

    But presumably the P-value is related to something then? As in what do I need to work it out using tables or a calculator?


  • #4
    GuanYin
    Closed Accounts Posts: 15,552 ✭✭✭✭GuanYin


    AngryBadger wrote:
    As I said something simple :p

    But presumably the P-value is related to something then? As in what do I need to work it out using tables or a calculator?

    Google is your friend.

    http://www.statsoft.com/textbook/sttable.html#t


  • #5
    EmmB
    Registered Users, Registered Users 2 Posts: 4 ✭EmmB


    Yep just calculate Z, the test statistic...there can be different formulas for this depending on what type of data you're using. Then look up the corresponding P-value on that table, the p-value is the area under the normal curve..p-value can be interpreted as measure of statistical significance, the smaller the p-value the greater the statistical significance.


  • #6
    AngryBadger
    Closed Accounts Posts: 3,251 ✭✭✭AngryBadger


    Sirs I am in your debt. Much obliged.


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