Question: I need to know the 98% confidence interval. In a study of treatments for very painful cluster headaches, 152 patients were treated with oxygen and

I need to know the 98% confidence interval.

In a study of treatments for very painful "cluster" headaches, 152 patients were treated with oxygen and 157 other patients were given a placebo consisting of ordinary air. Among the 152 patients in the oxygen treatment group, 111 were free from headaches 15 minutes after treatment. Among the 157 patients given the placebo, 30 were free from headaches 15 minutes after treatment. Use a 0.01 significance level to test the claim that the oxygen treatment is effective. Complete parts (a) through (c) below. UTI Z UTIL H1 : P1 > P2 H1 : P1 # P2 H1: P1 # P2 Identify the test statistic. Z = 9.51 (Round to two decimal places as needed.) Identify the P-value. P-value = 0 (Round to three decimal places as needed.) What is the conclusion based on the hypothesis test? The P-value is less than the significance level of a = 0.01, so reject the null hypothesis. There is sufficient evidence to support the claim that the cure rate with oxygen treatment is higher than the cure rate for those given a placebo. b. Test the claim by constructing an appropriate confidence interval. The 98% confidence interval is

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