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22S:008 Exam 2, Part II, April 9, 1999
Name:_____________________________________________ Please circle one. Section: 11:30, 12:30 or 2:30
You may only use Minitab to answer these questions. Do not open any other software—no email, no Netscape,
no nothing!
Do not print anything on the Lab printers. Please enter all of your answers from the computer screen onto these
exam pages.
1. Enter the dataset named Realprop.mtw from the 22S-008 MTW data folder. These data give four
variables, market value, square footage, assessed value, and grade for 60 houses.
a) (3 pts) What is the equation for the fitted regression plane that predicts Market from Sq.ft and
Assessed together?
b) (2 pts) What are the residual and fitted values for the house with Sq.ft = 538 and Assessed = 28.2 ?
residual = _________ fitted value = ____________
c) (2 pts) What is the value of the residual standard deviation for the model fit in part a)?
residual standard deviation = ___________
2. Again use the dataset named Realprop.mtw from the 22S-008 MTW data folder.
a) (2 pts) Create a new variable called Sq.ft.sq that is the square of the variable Sq.ft . What is the
value of Sq.ft.sq for the third house in the dataset?
Sq.ft.sq = _________
b) (3 pts) What is the equation for the fitted quadratic regression curve that predicts Market from a
quadratic curve in Sq.ft?
c) (2 pts) What is the correlation coefficient between Sq.ft and Market?
correlation coefficient = ___________
