Question

A researcher examined the relationship between sleep hours and stress levels among NYC students. He studied 10 participants. He found that r-statistics is r = .620. What is his conclusion? Use alpha level = .05 Two-tailed test.

*Failed to reject the null hypothesis and conclude that there is no relationship between the two variables.

*Reject the null hypothesis and conclude that there is no relationship between the two variables.

*Reject the null hypothesis and conclude that there is a relationship between the two variables.

*Failed to reject the null hypothesis and conclude that there is a relationship between the two variables.

A researcher examined the relationship between SNS use and GPAs among BXYF students. She studied 20 students. What is the cut off points for r-statistics? Use the two-tailed test and alpha = .05.

0.423

0.378

0.444

0.433

Suppose the correlation between height and weight for adults is +0.40. what is the coefficient determination of the variability in weight can be explained by the relationship with height

16%
60%
40%
84%

Answer 1

1.

r = 0.620

Alpha = 0.05

Df = 10-1 = 9

Critical value = 0.602

*Reject the null hypothesis and conclude that there is a relationship between the two variables.

2.

Alpha = 0.05

Df = 20-1 = 19

The cut off point or r Statistics is 0.423

Therefore, 1st Option is correct.

3.

r = 0.40

Coefficient of determination = 0.40^2 = 0.16 or 16%

Therefore, 1st Option ia correct.

16%

Dear student,
I am waiting for your feedback. I have given my 100% to solve your queries. If you satisfied with my answer then please please like this.
Thank You