Compared with stanine scores,
z-scores have the advantage of being
a. all positive.
c. easier to learn to interpret.
b. more precise.
d. based on rank rather than raw score.
Ques. 2A third study with 2,000 subjects found an experimental group mean of 29.26 (SD = 2.5) and a control group mean of 29.26 (SD = 1.5). What is the average effect size of the three studies?
a. 1.09
c. 1.84
b. 1.66
d. None of these are true.
Ques. 3A study of a new reading training program achieved, with 100 subjects, the following results: experimental group mean = 30.25 (SD = 3.28) and control group mean = 25.14 (SD = 4.75). However, a second study with 541 subjects found experimental group mean = 28.81 (SD = 2.56) and control group mean = 26.62 (SD 2.01).
a. The first study had a higher effect size.
b. The second study had a higher effect size.
c. Both studies had similar effect sizes.
d. None of these are true.
Ques. 4The
z-scores for X and Y variables are exactly the same except they have opposite signs. The coefficient of determination is
a. 0.00.
b. -1.00.
c. +1.00.
d. not possible to compute with this information.
Ques. 5The coefficient of determination of an r = -.60 is
a. -.36.
c. -.77.
b. +.36.
d. None of these are true.
Ques. 6The Pearsons product-moment correlation describes the relationship between variables by
a. summing the variable and dividing by N.
b. summing the deviation scores squared and dividing by N.
c. summing the product of
z-scores and dividing by N.
d. None of these are true.
Ques. 7Refer to Exhibit 6-4. What percent of the variance of scores in Group 1 is common with the variance of scores in Group 2?
a. 56 percent
c. 72 percent
b. 69 percent
d. None of these are true.
Ques. 8Refer to Exhibit 6-4. Compute the Pearson's
r from the data.
a. .74
c. .92
b. .83
d. None of these are true.
Ques. 9A distribution with many high scores and a few scattered low scores is a ____ distribution:
a.
symmetrical.
c.
negatively skewed.
b.
positively skewed.
Ques. 10The coefficient of correlation reflects the
a. relation of a score to its distribution.
b. relation between variables.
c. typical performance of a group of students.
d. heterogeneity of performance of a group of students.
Ques. 11The closer the coefficient of correlation is to plus or minus 1, the greater will be the
a. effect size.
c. strength of the correlation.
b. significance of the study.
d. standard error.
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