Question
In 2002, 21 states in the U.S. required all motorcycle riders to wear a helmet (i.e., universal helmet law) while 29 states required only young
In 2002, 21 states in the U.S. required all motorcycle riders to wear a helmet (i.e., universal helmet law) while 29 states required only young riders to wear one (i.e., partial helmet law). For this year, the average motorcyclist fatality rate (fatalities per 1 million population) for universal law states was 9.93 with a standard deviation of 2.77. Partial helmet law states had an average motorcyclist fatality rate of 13.72 with a standard deviation of 5.68.
For the year 2002, was there a difference between the two groups? Employ a two-tailed t-test using a 95% confidence level.
For this problem:
a. state your assumptions (assume that the variances are not equal) (2 points)
b. state your hypotheses (2 points)
c. compute the test statistic (use the formula in the slides) (2 points)
d. calculate the critical value (remember to compute the appropriate degrees of freedom) (2 points)
e. draw a conclusion. (2 points)
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