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=σ2(n−1)s2 n: sample size s: sample standard deviation σ: population standard deviation (n−1): is also called "degrees of freedom"
• Chi-Square table gives critical value area to the right
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:
Chi-Squared hypothesis testing
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