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Which Treatment is Better?
A randomized controlled trial was designed to compare the effectiveness of splinting against surgery in the treatment of carpal tunnel syndrome. Results are given in the table below (based on data from "Splinting vs. Surgery in the Treatment of Carpal Tunnel Syndrome," by Gerritsen et al., Hornal of the American Medical Association, Vol. 288, No. 10). The results are based on evaluations made one year after the treatment. Using a 0.01 significance level, test the claim that success is independent of the type of treatment. What do the results suggest about treating carpal tunnel syndrome?
Successful Treatment Unsuccessful Treatment
Splint Treatment 60 23
Surgery Treatment 67 6
A survey was conducted to measure the height of men. In the survey, respondents were grouped by age. In the 20-29 age group, the heights were normally distributed, with a mean of 67.8 inches and a standard deviation of 4.0 inches. A study particip..
The diameters of ball bearings are distributed normally. The mean diameter is 74 millimeters and the variance is 16. Find the probability that the diameter of a selected bearing is less than 78 millimeters.
When we carry out a chi-square test of independence, the expected frequencies are based upon the Null hypothesis - true or false.
At the .10 significance level you will test to determine if there has been an increase in selling time. What is your decision?
Would it be reasonable to conclude that the 5 percent of the employees are not able to pass the random drug test?
Compute the coefficient of determination, r 2 , and interpret its meaning.
Your high school graduating class had 564 members. Thirty-three percent of these are expected to attend college. The probability that less than 160 will attend college is
Find a 90% confidence interval for the population mean salary of such personnel. What is the margin of error.
Consider a sample with data values of 10,20,12,17, and 16.... Compute the mean and median and explain how you get to the answer....
Compare and contrast quantitative and qualitative research designs. Identify and discuss some advantages and disadvantages for each type of research.
Test whether there is a difference in the mean of times men and women and determine the p-value.
In a paragraph explain the differences between the Independent Samples and Paired Samples T-Test. When do you use each? Purpose a research question that could be addressed using each test
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