Saturday
October 25, 2014

Homework Help: Statistics

Posted by Johnathon on Friday, April 15, 2011 at 10:49pm.

Before i state my question I would like to note that I have to do a one tailed test but i dont know how to with the information given. I need a standard deviation, i need a mean, but do i use the mean for yrs drivin or number accidents. Please explain

2.) Car insurance companies assume that the longer a person has been driving, the less likely they will be in an accident, and therefore charge new drivers higher insurance premiums than experienced drivers. To determine whether driving experience is related to the amount of car accidents, you survey a random sample of 12 Torontonians and ask them about the number of years they have been driving, and the number of car accidents they have been involved in during the past year. The data are presented below:

Driver #ofyrsdriving(X) #accidents (Y)
A 4.5 3
B 2.5 5
C 1.5 3
D 3 3
E 1.5 6
F 5 2
G 5 0
H 2 4
I 3 1
J 4 2
K 1 5
L 3 2

a. Determine whether the assumptions of car insurance companies are valid. Assuming =0.05, include the hypotheses, critical test statistic, conclusion, and all formulas and calculations.
b. Is it appropriate to conclude that lack of driving experience causes accidents? Why or why not?

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