Stat 2000, Section 001, Homework Assignment 6 (Due 10/15/2001 11:59pm)
- 0) Reading: Sections 2.4, 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 3 (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.