anonymous
  • anonymous
could anyone explain chi squared tests?
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Explain as in explain the equation or how it works?
anonymous
  • anonymous
equation
anonymous
  • anonymous
\[\sum_{i=1}^{k}(O _{i}-E _{i})^{2}/(E _{i})\] Where K is the number of categories. O sub i is the observed outcomes of i and E sub i is the expected number of outcomes. Do you have a software available to you such as StatCrunch?

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anonymous
  • anonymous
That equation is your test statistic. It will give you your value to put into the table to determine your P-Value.
anonymous
  • anonymous
no i'm just using excel
anonymous
  • anonymous
Since I don't know the exact commands for Excel, I'll explain that by hand. You take your observed value for each number/category (i), and subtract the expected value, which is calculated by your number of samples times the probability of i. (Observed value of 1 - expected value of 1)^2/(expected value of 1) + (Observed value of 2 - expected value of 2)^2/(expected value of 2) + etc.
anonymous
  • anonymous
thank you

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