Given: A bar chart showing the group data test scores for frst period angainst the frequency
To Determine: What measures of variance is best to describe Mr. Mack's 1st period scores
Solution
In statistics, variance measures variability from the average or mean. It is calculated by taking the differences between each number in the data set and the mean, then squaring the differences to make them positive, and finally dividing the sum of the squares by the number of values in the data set
The following are the four major measures of variance
Range: the difference between the highest and lowest values.
Interquartile range: the range of the middle half of a distribution.
Standard deviation: average distance from the mean.
Variance: average of squared distances from the mean