In a study of treatments for very painful \"cluster\" headaches, 151 patients we

Question

In a study of treatments for very painful "cluster" headaches, 151 patients were treated with oxygen and 144 other patients were given a placebo consisting of ordinary air. Among the 151 patients in the oxygen treatment group, 126 were free from headaches 15 minutes after treatment. Among the 144 patients given the placebo, 23 were free from headaches 15 minutes after treatment. Use a 0.05 significance level to test the claim that the oxygen treatment is effective. Complete parts (a) through (c) below.

hypothesis test?

Z score?

P-Value?

Confidence interval?

Explanation / Answer

a) H0: oxygen treatment is not effective

H1: oxygen treatment is effective

here we use chi sqaure test.

b)

I have used excel for the analysis.

c)

p value is < 0.05 so we reject H and conclude that oxygen treatment is effective.

oxygen   placebo   Total   free from headache Observed   126 23 149 (O - E)² / E   32.43 34.01 66.43 no free from headche Observed   25 121 146 (O - E)² / E   33.10 34.70 67.80 Total Observed   151 144 295 (O - E)² / E   65.52 68.71 134.23 134.23 chi-square 1 df

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