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21.  There a direct correlation between how long you study
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# Question : 21.  There a direct correlation between how long you study : 1991646

21.  There is a direct correlation between how long you study for a test and how many correct you achieve.  If you changed your measurement to see if there is an association between how long you study and how many errors you make on that test, your analysis would reveal

a.  a negative correlation

b.  a problem with directionality.

c.  a reduced strength of association.

d.  no zero order correlation.

22.  If you are computing a Pearson product-moment correlation, there might be a relation between two variables but your correlation coefficient might not reflect that relationship.  One problem could be that the relation between the two variables

a.  involves latent variables.

b.  is nonlinear.

c.  involves homogeneous subgroups.

d.  has a directionality problem.

23.  The Pearson product-moment correlation will give an accurate depiction of the strength of the relation between two variables if the relation is

a.  latent.

b.  directional.

c.  linear.

d.  factorial.

24.  If a researcher wanted to know whether certain behaviors are associated with income, he or she might be reluctant to travel of a poor part of town that has a high crime rate.  As a result, the data would not include very low values of income levels and the correlation coefficient would be lower than if such data were included.  The potential problem in this case is

a.  heterogeneous subgroups.

b.  nonlinear relationships.

c.  the presence of latent variables.

d.  a restrict range.

25.  When a researcher doesn’t have the very high and very low scores on a variable in a data set, a resulting correlation coefficient would not reflect the true strength of the relation between variables because of a problem with

a.  restricted range.

b.  directionality.

c.  a third variable.

d.  heterogeneous subgroups.

26.  Sometimes a sample of research participants consists of several smaller groups that are different from one another in critical ways.  A correlation coefficient in this situation would be lower than if the sample consisted of similar people.  This illustrates the problem of

a.  restricted range.

b.  heterogeneous subgroups.

c.  a third variable.

d.  directionality.

27.  The Pearson product-moment correlation and the Spearman correlation both involve

a.  higher order correlations.

b.  multiple regression.

c.  bivariate correlations.

d.  nonlinear correlations.

28.  An correlational analysis that involves two variables is called

a.  measured.

b.  analytical.

c.  linear.

d.  bivariate.

29.  If a correlational test involves data that fall on a continuum, the test involves

a.  a correlational measure.

b.  a test of association.

c.  ordinal variables.

d.  independent variables.

30.  If a correlational test involves data that are dichotomous, that is, if the data for a variable can take on only one of two variables, the test involves

a.  a correlational measure.

b.  a test of association.

c.  ordinal variables.

d.  independent variables.

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