Measures of Spread Task 1: Write a definition for each of these four measures. c

Question

Measures of Spread Task 1: Write a definition for each of these four measures. copying them from the textbook. Use your own words, rather than simply The RANGE: The VARIANCE: The STANDARD DEVIATION: Task 2 Instead of working with the set of all 50 ages of the Westvaco workers, let's focus our attention on the workers laid-off in round 1 of the lay-offs. Below are these ages, in ascending order 22, 30, 52, 53, 53, 55, 59, 63, 64, 66, 69, 1) Enter the ages of the Westvaco workers laid off in round 1 and graph a histogram of data using the given window setting WINDOW n=20 max 80 sc1 10 Yma Yscl

Explanation / Answer

Task 1

The range is simply difference between the maximum and minimum value.

Variance: The variance measures how far each number in the set is from the mean. Varianceis calculated by taking the differences between each number in the set and themean, squaring the differences (to make them positive) and dividing the sum of the squares by the number of values in the set.

Standard deviation is simply square root of Variance

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