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Biostatistics

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SUMMARY OF FORMULAS FOR CHAPTER 7 281<br />

7.3.2 Test statistic when<br />

sampling from normally<br />

distributed populations:<br />

population variances<br />

unknown and equal<br />

7.3.3, 7.3.4 Test statistic when<br />

sampling from normally<br />

distributed populations:<br />

population variances<br />

unknown and unequal<br />

7.3.5 Sampling from<br />

populations that are not<br />

normally distributed<br />

7.4.1 Test statistic for paired<br />

differences when the<br />

population variance is<br />

unknown<br />

7.4.2 Test statistic for paired<br />

differences when the<br />

population variance is<br />

known<br />

7.5.1 Test statistic for a single<br />

population proportion<br />

7.6.1, 7.6.2 Test statistic for the<br />

difference between two<br />

population proportions<br />

7.7.1 Test statistic for a single<br />

population variance<br />

7.8.1 Variance ratio<br />

t ¼ 1 x 2 ð<br />

s<br />

m ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi 1 m Þ 2 0<br />

, where<br />

s 2 p<br />

þ s2 p<br />

n 1 n 2<br />

s 2 p ¼ ð n 1 1Þs 2 1 þ ð n 2 1Þs 2 2<br />

n 1 þ n 2 2<br />

t 0 ¼ 1 x 2 ð<br />

s<br />

m ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi 1 m Þ 2 0<br />

, where<br />

s 2 1<br />

þ s2 2<br />

n 1 n 2<br />

t 0 1 ða=2Þ ¼ w 1t 1 þ w 2 t 2<br />

w 1 þ w 2<br />

z ¼ 1 x 2 ð<br />

s<br />

m ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi 1 m Þ 2 0<br />

s 2 1<br />

þ s2 2<br />

n 1 n 2<br />

t ¼ d<br />

sd<br />

m d0<br />

d<br />

z ¼ m<br />

p d<br />

s d =<br />

ffiffi n<br />

z ¼ ^p p 0<br />

rffiffiffiffiffiffiffiffiffi<br />

p 0 q 0<br />

n<br />

ð<br />

z ¼ ^p 1 ^p 2 Þ ðp 1 p 2 Þ 0<br />

, where<br />

^s^p1 ^p 2<br />

p ¼ x 1 þ x 2<br />

n 1 þ n 2<br />

, and<br />

^s^p1 ^p 2<br />

¼<br />

x 2 ¼ ðn<br />

1Þs2<br />

rffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi<br />

p ð1<br />

p Þ p<br />

þ ð 1 p Þ<br />

n 1<br />

s 2<br />

V:R: ¼ s2 1<br />

s 2 2<br />

n 2<br />

(Continued)

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