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14 lines
367 B
Markdown
14 lines
367 B
Markdown
#stats
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variance:
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$\frac{\sigma_m^2}{n_m} + \frac{\sigma_w^2}{n_w}$
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hypothesis test:
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$H_0: (\mu_m-\mu_w)=0$
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$H_a: (\mu_m-\mu_w) < 0$
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$\alpha = 0.05$
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$\frac{(\bar X_m-\bar X_w)-(\mu_m-\mu_w)}{\sqrt{\frac{\sigma_m^2}{n_m} + \frac{\sigma_w^2}{n_w}}}$
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If you need to estimate it
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$\frac{(\bar x_m-\bar x_w)-(\mu_m-\mu_w)}{\sqrt{\frac{s_m^2}{n_m} + \frac{s_w^2}{n_w}}}$ |