The mean scores of two groups participating in a study are ...

[scienceeasy]

The mean scores of two groups participating in a study are exactly the same for a particular variable. This suggests that the:
 
  a. average score is the same, but distribution of scores for each group are not known.
  b. distribution and range of scores will be similar.
  c. groups are definitely heterogeneous in relation to this variable.
  d. groups are very much alike in relation to the variable.

Question 2

Standard deviation is defined as:
 
  a. a difference score based on the lowest and highest value in the set.
  b. scores grouped so that the range in each set is standardized and equal.
  c. scores that have been standardized to have a mean of zero.
  d. the average difference between the mean and each of the scores in the set.

[apple]

Answer to Question 1

ANS: A
The mean is a measure of central tendency and indicates the average score of a group, but does not indicate the variability of the scores around the mean. A measure of dispersion is required to demonstrate the distribution of scores.
Because the mean is the same on one variable does not mean that the two groups are the same in other ways.
If groups are definitely heterogeneous in relation to this variable, this would mean that the groups are very different.
The exact same mean does not equate to sameness in other ways.

Answer to Question 2

ANS: D
Scores that have been standardized to have a mean of zero describes a Z-score.
The difference between the lowest and highest values in the set is a definition of the range of the data.
The standard deviation indicates the average deviation of a score from the mean in that particular sample. Just as the mean is the average score, the standard deviation is the average difference score.
Scores grouped so that the range in each set is standardized and equal refers to grouped frequency distributions.

[scienceeasy]

Thank you

[apple]

No problemo