Stat 2000, Section 001, Homework Assignment 6 (Due 2/28/2000 in class)

• 0) Reading: Sections 2.6, 2.7
  
  
• 1) Look at Assignment 5, Question 1 (the weather data) again. (7 Points)
  
  
  • Calculate the residuals.
  • Draw at least two different residual plots (make clear what you plot on the x-axis each time) and state your conclusion.
  • List at least two lurking variables that could have an influence on the weather data but do not show up in this data set.
    
    
• 2) Look at Assignment 5, Question 4 (the photocopying paper) again. (7 Points)
  
  
  • Calculate the residuals.
  • Draw at least two different residual plots (make clear what you plot on the x-axis each time) and state your conclusion. Does it make a difference if you know that Student 1 (Michelle) did the first 5 measurements and Student 2 (John) did the last 5 measurements?
  • List at least two lurking variables that could have an influence on the outcome of the measurements of the photocopying paper but do not show up in this data set.
    
    
• 3) Draw a Mosaic Plot for the data from Table 2.14 in Moore/McCabe. (6 Points)
  
  The horizontal subdivisions, from left to right, should be the age groups "25 to 34", "35 to 54", and "55 and over".
  
  The vertical subdivisions, from top to bottom, should be the education levels "College 4 Years", "Some College", "Completed High School", and "Uncompleted High School".
  
  The SAS output in Figure 2.39 in Moore/McCabe might be helpful when constructing the Mosaic Plot.
  
  
• 4) Look at the Mosaic Plot of the Titanic data again. (5 Points)
  
  
  
  
  • a) Mark the following regions, using the letters "A", "B", "C":
    "A": Second Class, Child, Female, Survived
    "B": Third Class, Adult, Male, Not Survived
    "C": Crew, Adult, Female, Survived
    
    
  • b) Indicate which of these statements is correct and which is incorrect:
    i) A very large percentage of First Class, Adult, Female survived.
    ii) A very large percentage of Second Class, Adult, Male survived.
    iii) There were more First Class than Third Class passengers.
    iv) There were more Crew members than First Class and Second Class passengers together.