Chi-Squared hypothesis testing - Hypothesis Testing

Chi-Squared hypothesis testing


If a claim is made about population variance, we can test this claim using our sample variance using a Chi-Squared distribution,

• Chi-Squared: X2=(n1)s2σ2X^2=\frac{(n-1)s^2}{\sigma ^2}
nn: sample size
ss: sample standard deviation
σ\sigma: population standard deviation
(n1)(n-1): is also called "degrees of freedom"
• Chi-Square table gives critical value area to the right
  • 1.
    Variance Hypothesis Testing
    A sample of 10 dumbbells is weighted. The variance of this sample is 25 grams. With a 90% confidence level what can be said about the following claims:
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Chi-Squared hypothesis testing

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