Open%20Crunchit!%20at%20the%20usual%20place

1

• Open Crunchit! at the usual place
• (bcs.whfreeman.com/crunchit/ips5e)
• Look at problem 2.13 on page 118-119
• bring that data into CrunchIt! and do a
  scatterplot. Which variable is the explanatory
  variable? the response? Describe the relationship
  you see between lean body mass and metabolic rate
  in a couple of sentences.
• now edit the plot to use different plotting
  symbols for the males and females. Now describe
  the relationship among the three variables.
• next find the slope and intercept of the
  regression line plot the line on the
  scatterplot. Interpret the meaning of the slope
  and intercept in the context of this problem.

2

• Look at problem 2.54 on page 149. The main
  question asked here is which of IQ and
  self-concept is better at predicting gpa. In
  each case, I want you to do scatterplots with
  plotted regression lines and to compute
  correlation coefficients to help in your answers.
  Interpret the slopes and intercepts in each case
  - dont forget to discuss in context!
• So, which explanatory variable is better at
  predicting gpa and why?

3

• As in the previous lab, copy the graphs into Word
  and write your responses to the questions asked
  in paragraph form. Make sure youre treating
  the data as numbers in a specific context!
• Save the graphs and the writeup in a file with
  the name yourlastnameLAB3.doc where
  yourlastname is replaced by your actual last
  name.
• Email it to me at frierson_at_uncw.edu by Friday at
  noon. This lab will count as a graded homework
  and so cannot be turned in later than noon on
  Friday.