Question

In a study of treatments for very painful "cluster" headaches, 144 patients were treated with oxygen and 153 other patients were given a placebo consisting of ordinary air. Among the 144 patients in the oxygen treatment group, 117 were free from headaches 15 minutes after treatment. Among the 153 patients given the placebo, 35 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.

Answer #1

Sample 1 : For oxygen group : n1=144 , X1=117

Sample 2 : For placebo group : n2=153 , X2=35

The estimate of the sample proportion is ,

The pooled estimate is ,

The null and alternative hypothesis is ,

(Claim)

The test is one-tailed test.

The test statistic is ,

The critical value is , ; From Z-table

The rejection rule is , reject Ho , if Z-stat>1.64

Decision rule : Here , Z-stat=10.06>1.64

Therefore , reject Ho.

Conclusion : There is sufficient evidence to support the claim that the oxygen treatment is effective.

In a study of treatments for very painful "cluster" headaches,
154 patients were treated with oxygen and 155 other patients were
given a placebo consisting of ordinary air. Among the 154 patients
in the oxygen treatment group, 114 were free from headaches 15
minutes after treatment. Among the 155 patients given the placebo,
30 were free from headaches 15 minutes after treatment. Use a 0.05
significance level to test the claim that the oxygen treatment is
effective. Find the test...

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In a study of treatments for very painful “cluster headaches”,
144 patients were treated with oxygen and 154 other patients were
given a placebo consisting of ordinary air. Among the 144 patients
in the oxygen treatment group, 116 were free from headaches 15
minutes after treatment. Among the 154 patients given the placebo,
33...

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treatment, 117 were free from the headache 15 minutes after
treatment. Among the group treated with ordinary air, 28 of them
were free from...

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type of migraines a simple random sample of patients were selected
and assigned to either the treatment or control group. 146 patients
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treatment. Among the group treated with ordinary air, 28 of them
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Question 2
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Question text
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