Biology Forums - Study Force

A negative z score is always
 
  a. above the median.
  b. below the median.
  c. a good score.
  d. a poor score.
  e. below the mean.

Ques. 2

The sum of the z-scores squared in any distribution is equal to
 
  a. zero. c. cN.
  b. 1.00 d. N2.

Ques. 3

The mean of all z-scores in a distribution is equal to
 
  a. zero.
  b. number in the distribution.
  c. the sum of all squared scores.
  d. the sum of all squared z-scores divided by N.

Ques. 4

The Pearson's r is not appropriate when the data are
 
  a. from a population. c. bivariate.
  b. heterogeneous. d. curvilinear.

Ques. 5

The denominator of the Smith and Glass effect size is
 
  a. the standard deviation of the control group.
  b. the difference between means.
  c. a weighted estimate of the population mean based on the means of both groups.
  d. a weighted estimate of the population standard deviation based on the variability within both groups.

Ques. 6

A stanine score of six would have a T-score of
 
  a. 60.
  b. above 50.
  c. between 45 and 55.
  d. between 55 and 65.
  e. below 60.

Ques. 7

Correlating the scores of 50 students on two tests, an investigator found that the sum of the z-score cross-products was 20 . The Pearson's product moment coefficient in this case is:
 
  a. impossible to compute with the information given.
  b. .02.
  c. .20.
  d. .40.
  e. None of these are true.

Ques. 8

In order to compute a correlation coefficient between traits A and B, it is necessary to have:
 
  a. one group of subjects, some of whom possess characteristics of trait A, the remainder possessing those of trait B.
  b. measures of trait A on one group of subjects and of trait B on another.
  c. one group of subjects, some of whom have both A and B, some have neither, and some have one but not the other.
  d. two groups of subjects, one which could be classified as A or not A, the other as B or not B.
  e. measure of traits A and B on each subject in one group.

Ques. 9

Which of the following is a bivariate distribution?
 
  a. Incomes of Denver teachers
  b. Reading test scores of 50 children taught by the phonics method
  c. Nursing license examination results for only male candidates
  d. Home-economics aptitude test scores of this year's freshmen
  e. Number of arrests made and years of experience of San Francisco policemen

Ques. 10

Standard deviation is
 
  a. from the same statistical family as the mean.
  b. used in conjunction with the median.
  c. less stable than variance.
  d. a measure of central tendency.

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