Under a scattergram, there is a notation that the coefficient of correlation is .06 . This means that
a. most of the cases are plotted within a range of 6 percent above or below a sloping line in the scattergram.
b. plus and minus 6 percent from the mean includes about 68 percent of the cases.
c. there is a negligible correlation between the two variables.
d. most of the data plotted fall into a narrow band 6 percent wide.
Ques. 2
Mary had a z-score of zero on the Graduate Record Examination and a percentile rank of 50 on the Law School Aptitude Examination. We can say
a. she failed both examinations.
b. she failed the GRE but not the LSAT.
c. she did better on GRE than on LSAT.
d. she did better on LSAT than on GRE.
e. she did equally well on LSAT and GRE.
Ques. 3
A student who sometimes scores high and sometimes scores low on a series of weekly tests will have a higher ____ than a student who makes the same score week after week.
a. Mean
b. Median
c. Mode
d. standard deviation
e. Polygon
Ques. 4
If the standard deviation of the score on this test is zero, we should conclude
a. nobody received even one question correct.
b. half the scores were below the mean.
c. half the scores were above the mean.
d. a computational error was made.
e. everybody received the same score.
Ques. 5
If you could have one wish granted concerning this test, you should choose a score
a. above the mean.
b. above both the mean and the median.
c. equal to the first quartile.
d. equal to a z-score of +1.5.
e. equal to a T-score of 55.
Ques. 6
Meta-analysis is used for
a. searching across similar studies for statistically similar conclusions.
b. systematically combining data from similar studies.
c. finding differences between statistical conclusions of several similar studies.
d. determining whether a study's results fit within the distribution of previous research.
Ques. 7
Analysis of analyses refers to
a. analysis of variance. c. meta-analysis.
b. Pearson's product moment correlation. d. standardization scores.
Ques. 8
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. 9
A 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.