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Identify the null hypothesis, alternative hypothesis, test statistic, P-value, conclusion about the null hypothesis, and final conclusion that adresses the original claim. Use the P-value method. 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 were free from headaches 15 minutes after treatment.
(a) Construct a 98% confidence interval estimate of the difference between the cure rate of the oxygen treatment , p1 and the cure rate of the placebo, p2.
(b) What does the confidence interval suggest about the effectiveness of the oxygen treatment? Why?
a researcher decides to test her hypothesis that some toys are more fun to play with than others so she decides to
Other than using t instead of z, what other differences are there between constructing a z-interval and constructing a t-interval?
Many people think that job satisfaction in workplace is directly related to annual income. To check the validity of this assumption survey of 430 active working adults in U.S was taken that relates their job satisfaction to their annual income.
Earthquakes. Suppose the probability of a major earthquake on a given day is 1 out of 10,000.
In your capacity as assistant to the administrator at Freedom Hospital, you have been asked to develop a graphical presentation that focuses on the insurance.
A random sample of 90 voters found that 38% were going to vote for a certain candidate. Find the 99% limit for the population proportion of voters who will vote for that candidate.
Assume that on January 1, 2014, Yard Waste Corp. signs a 6-year noncancelable lease agreement to lease an industrial-strength mulching machine. The following information pertains to this lease agreement.
a. Estimate a multiple linear regression model and interpret the coefficient for x2.
The Stanford Five-City Project is a comprehensive community health education study of five moderately sized Northern California towns.
Calculate the chi-square statistic χ2 to determine if there is enough evidence to conclude that the number of minutes spent online per day is related to gender.
The quality control director for a clothing manufacturer wants to study the effect of operators and machines on the breaking strength (in pounds) of wool serge material. Is there an interaction between operator and machine?
What advantage do decision trees provide and in what situations are they preferred to a payoff matrix - What is the expected value of perfect information
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