Ststistics

Independent Samples: Mann Whitney U test as

Dependent Samples: ___________

• Shapiro Wilk test

• Wilcoxon Signed Ranks test

• Levene's test

• Kruskal Wallis test

Which of the following scenarios is most appropriate for using a paired sample t-test?

• Comparing the mean salaries of employees from two different companies.

• Comparing the average scores of students before and after a specific training session.

• Testing the effect of two different fertilizers on plant growth in two separate plots.

• Evaluating the performance of two different groups on a math test.

What conclusion can be drawn if a paired sample t-test on pre-test and post-test scores yields a p-value of 0.65?

• There is strong evidence of improvement.

• There is significant evidence of no improvement.

• There is not enough evidence to suggest improvement.

• More data needs to be collected to draw a conclusion.

Which of the following statements is true regarding the Wilcoxon signed rank test?

• It requires the assumption of normally distributed differences.

• It can be used for data that is at least interval scale.

• It can be used with small sample.

• It is less powerful than the paired sample t-test.

When interpreting the p-value from a paired sample t-test, a p-value of 0.03 would imply:

• Strong evidence against the null hypothesis when the significance level is 0.05.

• Insufficient evidence against the null hypothesis when the significance level is 0.01.

• No evidence against the null hypothesis.

• Both A and B are correct.