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A researcher testing the affects of music on studying conducts a within participants design. The results are as follows: music 6,7,6,5,6,8,8, and no music 10,7,8,7,7,9,8
Conduct the appropriate analysis. If significant, compute the effect size and interpret.
What is the difference between a point estimate and an interval estimate? How would you calculate a confidence interval with a z test?
Suppose we drew a histogram of these 18 death rates using class intervals 1 — 1.9, 2 — 2.9, 3 — 3.9, 4 — 4.9 and 5 — 5.9. Using the histogram, we would
What is the probability density function for this uniform distribution?
Provide a 99% confidence interval for the population proportion of college students who worked to pay for tuition and living expenses.
Suppose the annual return on XYZ stock follows a normal distribution with mean 0.12 and standard deviation 0.30.
A new book is being released and a bookstore predicts that 70% of customers that walk through the door on the release day will purchase the book.
What are the 2 ways in which researchers assess the reliability of their measures? Be sure you understand the difference among these 2 approaches to reliability.
People with type O-negative blood are universal donors. That is, any patient can receive a transfusion of O-negative blood. Only 7% of the American population have O-negative blood.
What is the rejection point at α = .01 and indicate if you would accept or reject H o ?
Lab technicians at a major mdical lab can process an average of 400 blood samples a day with a standard deviation of 50 samples. The processing follows a normal distribution.
Distinguish the various observational study designs and the randomized controlled trial with regard to validity and feasibility.
Compute mean absolute percentage error (MAPE) of the forecasts.
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