ENVS178 Lecture Notes - Lecture 5: Moss Park, Lawrence Heights, Unimodality

• School: University of Waterloo
• Department: Environmental Studies
• Course: ENVS178
• Professor: Jeff Casello

Document Summary

Sometimes, an arithmetic average, i. e. =average in excel, is not appropriate. Let"s begin with a familiar example: the calculation of your final grade in a course. Suppose that your grade is based on 4 assignments worth 10%, 10%, 15% and 20%, a midterm worth. Assignment 4: a- (recorded as 83% based on uw conventions) The final grade would be calculated as follows: To calculate the final grade, it was necessary to calculate a weighted mean because the various assignments and tests did not contribute equally to the final grade. The weighted mean is used instead of the arithmetic mean when the observational units are not equivalent, i. e. are not of equal importance. (note: not unit or level of msm"t) There are many different circumstances that require the use of a weighted mean. Example 2: summary data (discrete variable) integer numbers.