Measures of Variability ( Post-test)

__________ describes how far a part scores are spread in a distribution.

• Variability

• Average

• Graphing

• Central Tendency

Teacher Adi  wants to ensure she is thorough in her review of student performance, so she decides to calculate 'standard deviation' as well. What must she do to figure out this measure of variability?

• Identify the central score.

• Find the score that occurs most often.

• Calculate the square root of the variance.

•     Subtract the lowest score from the highest score.

Teacher Adi has just given a math exam and wants to calculate the 'range' of performance of her students. What must she do?

• Identify the central score.

• Find the score that occurs most often.

• Identify how far from average each score is.

• Subtract the lowest score from the highest score.

The following are the  measure of variability EXCEPT.

• Mean

• Range

•   Average     deviation

•     Variance

If the range of a set of data is 9, and the highest score is 25, what is the lowest score?

• 18

• 17

• 16

• 15