Which of the following measures is merely a simple difference ...

[Evvie72]

Which of the following measures is merely a simple difference score?
 
  a. Standard deviation = 2.41
  b. Difference scores = 2, 2, 1, +2, and +3
  c. Range = 8
  d. Variance = 5.80

Question 2

In the data set below, what is the mean ( )? X f 5 4 4 2 3 1 2 1 1 2
 
  a. 4
  b. 3.5
  c. 3
  d. 2.5

[nicoleclaire22]

Answer to Question 1

ANS: A
The simplest measure of dispersion is the range. In published studies, range is presented in two ways: (1) the range is the lowest and highest scores, or (2) the range is calculated by subtracting the lowest score from the highest score. In this form, the range is a difference score that uses only the two extreme scores for the comparison. The range is generally reported in published studies but is not used in further analyses.

Answer to Question 2

ANS: B
The measures of central tendency are mode, median (MD), and mean ( ). The mean is the arithmetic average of all a variable's values in a study and is the most commonly reported measure of central tendency. The mean is the sum of the scores divided by the number of scores being summed. Mean ( ) =  N = 35  10 = 3.5.