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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.
Test for significant differences among weight losses for the five diets, and perform all pair wise comparisons using:
The distribution of 9 ounce bags of a particular bag of potato chips is approximately Normal with a mean of 9.12 ounces and a standard deviation of 0.15 ounces.
A large retail corporation plans to sample sales receipts of its meat department to estimate the average size (in dollars) of a customer purchase. Previous analysis suggest that the standard deviation of the purchase amount is approximately $50.72..
To determine monthly rental prices of apartment units in San Francisco Bay area, samples were constructed in the following ways. Identify the technique used to produce each sample.
Based on these results, the proportion of the variation in 1993 winnings that is explained by the average number of putts per round and driving distance
Develop a probability distribution for the number of travelers who plan their trips within two weeks of departure.
At a 5% level of significance, is there enough evidence from this survey to conclude that more than half of all adults would rather have $100 than a day off?
At.05 level of significance can director conclude that there is difference in the number of circuit cards bought by month?
The null hypothesis is to be tested at 95% confidence. Determine the critical values for this test.
Assuming that these are a random sample of all publicly traded companies, construct a 95% confidence interval for the overall noncompliance proportion.
Determine the completion time and standard deviation (σ) for project roundoff the standard deviation to the nearest hundredth: two decimal places.
Calculate the control limits for a c chart when Ubar = 3.0%, n = 60, and you collect one sample per hour for 40 hours of production. (2 sets of control limits required, x bar and range)
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