Assignment 5 Chapter 2 Relationships pp 79 84 Homework 1 2 2 5 2 6 To acquire valid information one must measure same variables for each case Variables are associated if knowing about one provides information about another Explanatory variable more commonly called independent variables IV This is also called the influencing variable or the variable that influences or explain another variable Response variable more commonly called dependent variables DV This is also called the influenced variable or the variable that is explained by another variable 2 5 p 84 A study was done to identify variables that might produce high click counts on Twitter You and nine of your friends collect data on all of your tweets for a week You record the number of click counts the time of day the day of the week the sex of the person posting the tweet and the length of the tweet a What are the cases for this study You nine of your friends b Identify each of the variables in the study then classify them as quantitative or categorical c classify each variable as explanatory IV or response DV cases Variables Click count Time of day Day of the week gender Length of tweet You Friend 1 Friend 2 Friend 3 Friend 4 Friend 5 Friend 6 Friend 7 Friend 8 Friend 9 Categorical or quantitative Q Q C C Q IV IV IV IV DV IV or DV 2 6 p 84 For each of the following scenarios classify each of the pair of variables as explanatory or response or neither Give reasons for your answers a sing and dance neither some sing don t dance and vice versa some do neither some do both b pages in text and cost of text Response cost of texts influencing pages in text c of drinks and blood alcohol level Response blood alcohol level influencing of drinks d Dosage of vitamin D and mineral content of bones Response mineral content in bones Influencing dosage of vitamin D 1 Take the response variable DV body weight Identify at least ten 10 potential influencing variables IVs that might predict a person s body weight Identify each as quantitative Q or categorical C Q C circle one 1 of calories 2 Height 3 Exercise 3 days a week 4 Muscle Mass 5 Steps per day 6 Gender 7 Anorexia 8 Emotional Health 9 Finances 10 Age 2 Motivation 3 Confidence 4 Perfect attendance 5 7 8 Hours of sleep 6 of math classes Q C Q C Q C Q C Q C Q C Q C Q C Q C Q C Q C Q C Q C Q C 2 Take the response variable DV performance on statistics final exam Identify at least six 6 potential influencing variables IVs that might predict a person s performance Identify each as quantitative Q or categorical C 1 Study more than 3 hours a week Q C circle one