STAT 100 Lecture Notes - Lecture 7: Measuring Instrument, Round-Off Error, Line Graph

• School: Simon Fraser University
• Department: Statistics
• Course: STAT 100
• Professor: Gamage Perera

Document Summary

Example 1: a local health club is doing a survey to see if there is a relationship between strength and fitness. They want to measure the strength and fitness of a sample of 100 members of the club. Example 2: a study on customer service found there were more customer complaints registered at a large local grocery store in the past year than at a small local market. Measurement: assigning a number to represent some property or characteristic. We must be aware of the units of measurement. Knowing this will help us make the right measurement. Example 3: bureau of labor statistics calculates unemployment rate. This rate defined as: (# of people unemployed) / (# of people in labor force) A variable is a valid measure of a characteristic if it is relevant or appropriately represents that property. A rate is given as a fraction, proportion or percentage. A rate measures how regularly something occurred.