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A clinical trial is conducted comparing a new pain reliever for arthritis to a placebo. Participants are randomly assigned to receive the new treatment or a placebo. The outcome is pain relief within 30 minutes. The data are shown in table:
Pain relief no Pain relief New medication 44 76Placebo 21 99
Is there a significant difference in the proportions of patients reporting pain relief?
Run the test at a 5% level of significance.
Compute the range and interquartile range
Do the data you obtained provide enough evidence to reject the claim? Use a 1% level of significance.
First-order regression model was fit to data. Part of printout follows?
The daily numbers of calls received by the Internal Revenue Service office in July are shown below:
How large a sample is needed to find the population mean within $250 at 99 percent confidence?
At the .05 significance level, can she conclude that there is a difference in the mean amount of weight loss among the three diets?
Find out the variance for percentage of tickets? Determine the probability that your sample will have the average between 70 and 75?
The null hypothesis is that there was no change in average liquor consumption. State this formally in terms of µ.
Explain in words general pattern of correlation is statistically important.
In a group of seven adult friends, what is the probability that: a) no one has done a one-time fling?
You are interested in determining the average cost of a 3-minute telephone call to locations within the continental U.S.
ABC Corporation of California publishes a variety of statistics, including the number of individuals who got a new job during the past 12 months and the mean length of time the individuals have been on the job.
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