(Answered) Assume a researcher compared the performance of two

Statistics

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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