Measures of Variability ( Pre-test )

Teacher Nicka 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.

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

• Get the dispersion of data about the average.

• Find the score that occurs most often.

• Calculate the square root of the variance.

• Subtract the lowest score from the highest score.

_______________describes how far a part scores are spread in a distribution.

• Central Tendency

• Average

• Graphing

• Variability

The ________________ is a measure of variability.

• Mean

• Average deviation

• Median

•     Mode

If the range of a set of data is 16, and the highest score is 25, what is the lowest score?

           

• 8

• 9

• 10

• 11