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Assume a researcher compared the performance of two independent groups of participants on an ordinal variable using the Mann-Whitney U test. The first group had 8 participants and the second group had 11 participants.
a. Using a p level of 0.05 and a two-tailed test, what is the critical value?
b. Assume the researcher calculated U1 = 22 and U2 = 17. Make a decision regarding the null hypothesis and explain that decision.
c. Assume the researcher calculated U1 = 24 and U2 = 30. Make a decision regarding the null hypothesis and explain that decision.
d. Assume the researcher calculated U1 = 13 and U2 = 9. Make a decision regarding the null hypothesis and explain that decision.
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Provide an appropriate statistical description and summary of this data set; comment on any distinctive characteristics and postulate potential explanations for your observation.
Estimate the true weight with an error of 0.03 grams with 99 percent confidence? How to construct a 95 percent confidence interval for the population proportion of positive drug tests. How to tell if the normality distribution?
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