1. A t-test should be used when the standard deviation of thepopulation is known, whereas a z-test should be used when thestandard deviation of the population is unknown. True orFalse?
2. If r = 0.72, what proportion of the variance inY is accounted for by it's relationship withX?
A. .72
b. .52
c. .36
d. .85
3.Jane conducts a Pearson correlation to assess the relationshipbetween years of marriage and happiness from data collected from100 individuals. What's df in this study?
a.98
b. 99.
C. 100
d. Not enough information
4.A study with 46 participants investigated whether there was arelationship between one’s attitude toward giving blood and thenumber of times one has given blood in a year. The correlationcoefficient was r = +0.56. Thus, the rcritrcrit is±0.288±0.288 True or False?
