One of our best aids in handling problems of non-normality is
a. the variance sum law.
b. the central limit theorem.
c. the non-normality correction.
d. the Stroop test.
Question 2The normality assumptions behind the independent groups t test
a. is one that we cannot get around.
b. diminishes in importance as the variance of the two groups increases.
c. is absolutely unimportant.
d. diminishes in importance as the sample sizes increase.
Question 3When we say that two independent variables, such as gender and age, are confounded, we mean that
a. one variable blocks the influence of the other.
b. we cannot completely tell the effect of gender apart from the effect of age.
c. we cannot do anything with the study.
d. the data were collected carelessly.
Question 4When we have very unequal sample variances, we should
a. check our work very carefully when we pool the variances.
b. not pool the variances.
c. average the variances, but not weight them with the degrees of freedom.
d. run some different analysis.
Question 5In the previous test on the treatment of anorexia, the resulting t was 3.22, which was significant (p < .05). This tells us that
a. the family therapy condition had a mean that was reliably less than the mean of the control condition.
b. the family therapy condition had a mean that was reliably more than the mean of the control condition.
c. the family therapy condition had a mean that was unreliably less than the mean of the control condition.
d. the family therapy condition had a mean that was unreliably more than the mean of the control condition.
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