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You want to compare response rates (percents) of two regimens. A power of 90% and a two-sided test of size 0.05 are desired. How many patients are needed to detect a difference between true response rates of p1=30% and p2=50%? Let the proportion in group 1 be q1 = 0.4. Use the appropriate formula and show your work
Using the 0.01 significance level, can we conclude that there is a positive correlation between the variables?
What is the probability that a call lasted between 180 and 300 seconds? What is the length of a call if only 1% of all calls are shorter?
question according to a study several years ago the average bmw driver earns 82 600 per year. suppose a researcher
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To test the hypothesis that students who finish an exam first get better grades, Professor Barker kept track of the order in which papers were handed in.
question how are the degrees of freedom for the chi-square hypothesis tests different from those of most other
frans convenience marts are located throughout a metropolitan area. fran the owner would like to expand into other
mary is deciding whether to book the cheaper flight home from college after her exams but shes unsure when her last
1. in 2005 the average gpa for students was 3.15. a sample in 2008 showed that the average gpa for students was 3.46.
q1. describing data frequency distribution and graphic presentationsyou are the parts manager for a local dumb phone
What internal and external threats are and could you provide some examples of what would be considered a threat to internal and/or external validity of a study design.
Due to financial hardship, the Nyke shoe company feels they only need to make one size of shoes, regardless of gender or height. They have collected data on gender, shoe size.
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