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Unformatted text preview: H0: number of mother ranks higher is the same as number of mother ranks lower. Ha: number of mother ranks higher is higher than mother ranks lower. Step 2: T = T + = 15. When n = 20, one-tailed with = 0.01 cant be found from table. Therefore, use normal approximation. E(T) = (20)(0.5) = 10 and V(T) = (20)(0.5)(0.5) = 5 TS = (15 10)/ 5 = 2.24. It has approx. standard normal distribution. Step 3: p-value = P(Z > 2.24) = 0.5 0.4875 = 0.0125. Since p-value < , we reject H0 and conclude that we have enough statistical evidence to infer that children feel less pain than adults do. Note: the calculate p-value is different from the one obtained from SGP output. Can you explain why? Page 1 of 1...
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This note was uploaded on 01/17/2010 for the course STATS 2225 taught by Professor Li during the Spring '09 term at Langara.
- Spring '09