SOCSCI 2J03 Lecture Notes - Lecture 8: Central Tendency, Weighted Arithmetic Mean

• School: McMaster University
• Department: Social Sciences
• Course: SOCSCI 2J03
• Professor: Rizwan Tahir

Document Summary

Variance and standard deviation: the mean for ungrouped data is obtained by dividing the sum of all values by the number of values in the data set. N x x n: the mean is usually known as an extreme value or an outlier, affected by extreme outliers. Median: the median is the value that divides a data set that has been ranked in increasing order in two equal halves (the middle value when ranked from lowest to highest) If the data set has an odd number of values, the media is given by the value of the middle term in the ranked data set. Ex: 1, 3, 4, 7, 8, 9, 10 the median is 7. If the data set has an even number, the media is given by the average of two middle of the values ranked in the data set.