Math 130 Spring 2009
Homework 10
Due Monday, April 27
Ch 19 # 1-4, 5a, 7, 9, 11, 31, 45, 47 (you'll want to use SPSS for #7 onward)
Ch 13 # 1-5, 9, 11, 28, 31
Ch 20 # 1, 3, 5, 9, 11, 13, 17, 31, 33, 41, 43
SPSS Project: Fatal Automobile Crashes
The source for data in these problems is the U.S. Dept. of Transportation Fatality
Analysis Reporting System
Problem A. Drunk Drivers
Use the file MO_2003_accidents, which contains a record for every fatal
automobile accident in Missouri for 2003.
Find the mean number of people involved
(NUMBER_PERSON_FORMS) and number of drunk drivers involved
(NUMBER_DRINKING_DRIVERS) per fatal crash in Missouri in 2003,
and give 95% confidence intervals for both numbers.
Problem B. Striking Vehicles
Use the file MO_2003_vehicles, which contains a record for every vehicle
involved in a fatal automobile accident in Missouri for 2003.
a. The variable TRAVELSPEED gives the speed at the time of accident for
each vehicle, in miles per hour. Special codes 98 and 99 are used when
the speed is unknown or missing. Recode these to “System Missing” so
they will be omitted from the analysis. Make and print a histogram of
TRAVELSPEED. Is it normal? Do you think it's reasonable to use t-tests
with this data?
b. A vehicle with a 1 or a 3 in VEHICLE ROLE is a striking vehicle – the car
that struck the other car or obstacle. Define a new variable STRIKING,
using the ANY() function.
Explore how speed varies between STRIKING and non-STRIKING
vehicles. State and carry out a hypothesis test that these two groups have
a difference in speed.
c. State and carry out a hypothesis test that NUMBEROFDEATHS is
different for the striking and non-striking groups.
