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Hypothesis testing
What do we need to consider when we try to select a test? Choose one of the tests; discuss your understandings of that test. Use some examples to demonstrate your understanding.
In a randomized clinical trial of timolol vs. placebo in patients surviving acute myocardial infarction, the total deaths at an average of 24 months after treatment were found to be 65 out of 720 in the Timolol group and 112 out of 860 in the plac..
Develop a probability for the number of students in the sample who watch soap operas.
A researcher reports an F-ratio with df = 3, 36 from an independent-measures study. How many treatment conditions were compared in the study?
Assuming that the heights of college women are normally distributed with mean 62 inches and standard deviation 3.5 inches, what percentage of women are between 58.5 inches and 72.5 inches?
Choose one time-series describing Spirit Airlines and make a line chart. (b) Describe the trend (if any) and discuss possible causes.
Note down a research that requires a decision making with probabilities.
Data analysis must be completed using a statistical software package - either Statistix for Windows, with the MegaStat add in, SPSS, SAS, R or any other legitimate software package.
How large a sample should she check in order to be 93 percent confident that the true proportion is estimated to within 0.014?
Why is the F distribution important? How do you determine if a significant difference exists among the groups in ANOVA? How do you determine differences between the groups in ANOVA?
Researchers routinely choose an -level of 0.05 for testing their hypotheses. What are some experiments for which you might want a lower -level (e.g. 0.01)?
a. What decision would maximize expected profits? b. What is the maximum amount that should be paid for a perfect forecast of the economy?
Both objective and subjective criteria should be used to determine whether a process is in control. Do you agree or disagree?
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