27. The mean of the differences between before and after measurements is denoted

Question

27. The mean of the differences between before and after measurements is denoted as ___.

a. Xdifference

b. XD

c.

d. D

28. When a dependent sample study reports measurements before and after a treatment, the focus of the hypothesis test is on the ____.

a. measurement before the treatment

b. measurement after the treatment

c. differences

d. variance of the measurements

29. A researcher is planning a study of graduate students’ sleep deprivation. Assume that the population mean and standard deviation are provided, and a random sample of 25 students are drawn to participate. What statistical procedure is appropriate for conducting the study?

a. Independent samples t-test

b. Z-test

c. Dependent samples t-test

d. One-sample t-test

30. The statistical procedure that calculates a linear relationship between two interval/ratio variables is known as _______.

a. dependent samples t-test

b. independent samples t-test

c. Pearson’s correlation

d. bi-serial correlation

Explanation / Answer

27)   d) D=d bar=(sum of the differences between before and after measurements)/no.of observations

28)   c. differences=under the hypothesis that there is no significance difference between before and after measurements

29)   d. One-sample t-test

30)   c. Pearson’s correlation

Related Questions

Navigate

• Browse (All)
• Browse 2
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.