Author Question: When estimating the population mean on the basis of the information contained in a single sample, ... (Read 131 times)

moongchi · **on:** Jun 20, 2018

When estimating the population mean on the basis of the information contained in a single sample, one must at least know

a. the estimated standard error of the mean and the mean of the sample
b. the z score for each raw score
c. the standard deviation of the underlying distribution of individual scores
d. the interdecile range

Question 2

For the majority of the items in any given test, the difficulty index
should be kept at approximately

a. .99
b. .50
c. .01
d. none of these, since item difficulty is not a quantifiable value.