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Hypothesis Testing on Motor Vehicle Accidents

A random sample of 400 college students was selected and 120 of them had at least one motor vehicle accident in the previous two years. A random sample of 600 young adults not enrolled in college was selected and 150 of them had at least one motor vehicle accident in the previous two years. At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period.

1. Is this a 1 or 2 tail test?
2. Is this a one sample or two sample test?
3. Is this a test of sample means or sample proportions?
a.) sample proportions, b.) sample means, c.) both, d.) neither
4. What are your critical values? a.) +-1.65, b.) +-1.96, c.) 1.74, d.) 1.79
5. What is the value of your pooled proportion? a.) .27, b.) .73, c.) .55 d.) .05
6. What is the value of your test statistic? a.) 1.96, b.) 1.65, c.) 1.74, d.) .05
7. What is your decision? a.) Reject Ho, b.) Reject H1, c.) So not reject Ho, d.) none of the above

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