# 9.6: Chapter Formula Review


## 9.3 Distribution Needed for Hypothesis Testing

Sample size Test statistic
($$\sigma$$ unknown) $$t_{c}=\frac{\overline{X}-\mu_{0}}{s / \sqrt{n}}$$
($$\sigma$$ known) $$Z_{c}=\frac{\overline{X}-\mu_{0}}{\sigma / \sqrt{n}}$$
Table $$\PageIndex{6}$$ Test Statistics for Test of Means, Varying Sample Size, Population Known or Unknown

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