In a study of treatments for very painful "cluster" headaches, 158 patients were treated with oxygen and 142 other patients were given a placebo consisting ofordinary air. Among the 158 patients in the oxygen treatment group, 123 were free from headaches 15 minutes after treatment. Among the 142 patients given theplacebo, 29 were free from headaches 15 minutes after treatment. Use a 0.01 significance level to test the claim that the oxygen treatment is effective. Completeparts (a) through (c) below.Identify the P-value.P-value = 0.000(Round to three decimal places as needed.).What is the conclusion based on the hypothesis test?The P-value is less thanrejectthe significance level of α=0.01, sothe null hypothesis. Therethe 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 0.452 (P₁-P2) <0.696(Round to three decimal places as needed.)is sufficientevidence to support the claim that

The given significance level is 0.01.

Answered: In a study of treatments for very…

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.3: Measures Of Spread

Problem 1GP

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Many people take ginkgo supplements advertised to improve memory. Are these over-the- counter supplements effective? In a study, elderly adults were assigned to the treatment group or control group. The 104 participants who were assigned to the treatment group took 40 mg o ginkgo 3 times a day for 6 weeks. The 115 participants assigned to the control group took a placebo pill 3 times a day for 6 weeks. At the end of 6 weeks, the Wechsler Memory Scale was administered. Higher scores indicate better memory function. Summary values are given in the following table: N Ginkgo 104 5.7 0.6 Placebo 115 5.5 0.5 Perform the appropriate test to determine if taking 40mg of ginkgo 3 times a day is effective in increasing mean performance on the Wechsler Memory Scale. > Is the study observational or designed experiment? > Can you conclude association or causation with this type of study? Is this a matched-pair dependent test or two-sample independent test?
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