A researcher who is interested in new car sales but who discovers that the secondary
data from the U.S. government are in the form of statistics that include both car and
light truck sales combined in the data has discovered that the data fail to meet which
criterion?
A.Are the data in the correct unit of measurement?
B.Do the data apply to the time period of interest?
C.Are the data supplied by a reputable source?
D.Do the data show evidence of reliability and validity?
In an ANOVA test of the differences between the means of three groups, the null
hypothesis is _____.
A.m1 = m2 = m3
B.m1 m2 m3
C.m1 – m2 – m3 = 0
D.m1 + m2 + m3 = 1
_____ is the process of describing some property of a phenomenon, usually by
assigning numbers, in a reliable and valid way.