Help on advanced statistics
1. Which of the following research situations is most likely to use an independent-measures design (test)?
a. Evaluate the effectiveness of a diet program by measuring how much weight is lost during four weeks of dieting.
b. Evaluate the effectiveness of a cholesterol medication by comparing cholesterol levels before and after the medication.
c. Evaluate the difference in verbal skills between 3-year old girls and 3-year old boys.
d. Evaluate the development of verbal skills between age 2 and age 3 for a sample of girls.
2. The null hypothesis for the independent-measures t test states ________________.
a. There is no difference between the two sample means
b. There is no difference between the two population means
c. The difference between the two sample means is identical to the difference between the two population means
d. None of the other three choices are correct
3. A positive value for a correlation indicates ________________.
a. Increases in X tend to be accompanied by increases in Y
b. Increases in X tend to be accompanied by decreases in Y
c. A much stronger relationship than if the correlation was negative
d. A much weaker relationship than if the correlation were negative
4. The numerical value for a correlation _______________.
a. Can never be greater than 1.00
b. Can never be less than -1.00
c. Can never be greater than 1.00 and can never be less than -1.00
d. Can be greater than 1.00 and can be less than -1.00
5. The Pearson correlation measures _______________.
a. The degree of relationship without regard to the form of the relationship
b. The degree to which the relationship is consistently one directional
c. The degree of linear relationship
d. The degree of curvilinear relationship
6. A Pearson correlation of r = +1.00 between X and Y indicates ______________.
a. Each time X increases, there is a perfectly predictable increase in Y
b. Every change in X causes a change in Y
c. Every increase in X causes an increase in Y
d. All of the other 3 choices occur with a correlation of +1.00
7. Which of the following sets of correlations correctly shows the highest to lowest degree of relationship?
a. -0.91, +0.83, +0.10, -0.03
b. -0.91, +0.83, -0.03, -0.10
c. +0.83, +0.10, -0.91, -0.03
d. +0.83, +0.10, -0.03, -0.91
