A researcher is calculating the Pearson correlation between height (X) and weight (Y) for a sample of 10-year-olds. She finds SP = 80, SSX = 130, and SSY = 140. What is the correlation coefficient?
a.) 0.59
b.) 0.66
c.) 0.35
d.) 0.77
2. A researcher is calculating the Pearson correlation between X and Y for a sample of 40. She finds ΣXY = 806 and ΣX = 18.4. What is the value of SP for this data?
a.) 70.0
b.) 88.4
c.) 42.8
d.) 46.3
3. A researcher working with a sample of 35 finds a Pearson correlation of 0.45 between two variables. What is the t-score corresponding to these results?
a.) 2.58
b.) 3.24
c.) 3.49
d.) 2.89
4. All else held equal, which of the following changes will result in a larger t value for a Pearson correlation?
a.) larger mean value
b.) larger correlation
c.) smaller r^2
d.) smaller sample size
5. Two variables have a Pearson correlation of 0.10. Which of the following is a possible explanation for this result?
a.) the two variables have an almost perfect relationship.
b.) the two variables have a strong positive relationship.
c.) the two variables have a curvilinear relationship.
d.) the two variables have a strong negative relationship.