Measures of Dispersion

Determine the value of x in the cumulative frequency table below.

• 10

• 11

• 12

• 13

Which measure of spread should be used to describe the distribution?

• standard deviation

• interquartile range

• range

• median

Calculate the standard deviation for the following data.

• 2.928

• 4.848

• 5.148

• 6.227

Using the grouped data, solve for the standard deviation.

• 9.993

• 9.789

• 10.789

• 9.399

Given the data find the POPULATION standard Deviation by Calculator.

• 14.1

• 20.2

• 14.0

• 13

For the following data find the SAMPLE standard Deviation by Calculator

• 20.2

• 13

• 14.1

• 13.99

For the following data find the POPULATION VARIANCE by calculator

• 199.078341

• 195.9183673

• 14.1

• 13.99

Determine the value of x in the cumulative frequency table below.

• 10

• 11

• 12

• 13

Which of the following is NOT a measure of dispersion for grouped data? (a) Range (b) Mean (c) Interquartile Range (d) Standard Deviation

• Median

• b

• Mode

• Variance

What does the interquartile range (IQR) represent? The spread of the entire dataset. The spread of the middle 50% of the data. The difference between the highest and lowest values. The average deviation of data points from the mean.

• The spread of the middle 50% of the data.

• The average deviation of data points from the mean.

• The difference between the highest and lowest values.

• The spread of the entire dataset.