ISI
Lab 9

1: Introduction 2: Research Question 1 3: Inference 4: Research Question 2 5: Inference 6: Research Question 3 7: Inference 6: Research Question 4 7: Inference 8: Research Question 5 9: Research Question 6
Labs

Research Question 4: Do students taking more classes tend to have heavier backpacks (higher ratios)?

Descriptive Statistics

(l) Consider the variable units taking. Would you classify this variable as categorical or quantitative? Would you consider this variable as the response variable or the explanatory variable?

 

(m) Use technology to construct an appropriate graphical display for examining the relationship between units taking and ratio. Include this graph in your report.

JMP

Minitab

R

Applets

Choose Analyze > Fit Y by X Move ratio into the Y, Response box and >Units into the X, Factor box. Press OK .

Choose Graph > Scatterplot Select theSimple option.

plot(backpackdata$ratio ~ backpackdata$units)

Either select only these two columns or select a larger set including these two columns and paste the data into the Corr/Reg applet. Set up Units as the explanatory variable and ratios as the response variable.

 

(n) Write 1-2 sentences describing the relationship as revealed by this graph.