The study described above is an example of
a. experimental research
b. post-facto research
c. correlational research
d. longitudinal research
Question 2Ordinal data are summarized using the _____ as a measure of variability.
a. range
b. standard deviation
c. variance
d. We do not have enough information to decide.
Question 3The standard error of the mean must equal
a. the standard deviation of the sample's distribution of individual scores
b. the standard deviation of the entire population's distribution of
individual scores
c. the average of the sample's distribution of individual scores and the
population's distribution of individual scores
d. the standard deviation of the entire sampling distribution of means
Question 4The z test assumes that
a. the sample mean is equal to the population mean
b. the standard deviation of the sample scores is equal to the standard
deviation of the distribution of sample means is normal
c. the distribution of sample means is normal
d. none of these, since the z test is assumption free