Variability Explained (Statistical Methods in Psychology II)

1. Which of the following outcomes isleastimpressive??

A) t(14) = 2.30,p< .05, 27.4% of the variability is explained.

B) t(12) = 2.10,p> .05, 26.9% of the variability is explained.

C) t(80) = 5.00,p< .001, 23.8% of the variability is explained.

D) t(50) = 2.80,p< .01, 13.6% of the variability is explained.

2. You conduct a study looking at the relationship between the number of text messages sent per day and level of general happiness in teens. You find that you have failed to account for 64% of the variability in your study, but have noted that the fewer text messages sent, the greater the level of happiness. From this information, you know that your correlation between text messages and happiness level is...

A) .80

B) There is not enough information given to definitely say.

C) -0.80

D) .64

E) -.60

F) .36

G) .60

3. One of the goals of Hypothesis Testing is to tell us what the probability of observing an outcomejust by chanceis.

A) True

B) False