Question 249571: 16.The use of cellular phones in automobiles has increased dramatically in the last few years. Of concern to traffic experts, as well as manufacturers of cellular phones, is the effect on accident rates. Is someone who is using a cellular phone more likely to be involved in a traffic accident? What is your conclusion from the following sample information? Use the .05 significance level.
 / Had Accident in the Last Year / Did Not Have an Accident in the Last Year
Uses a cell phone / 25 / 300
Does not use a cell phone / 50 / 400
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! The use of cellular phones in automobiles has increased dramatically in the last few years. Of concern to traffic experts, as well as manufacturers of cellular phones, is the effect on accident rates. Is someone who is using a cellular phone more likely to be involved in a traffic accident? What is your conclusion from the following sample information? Use the .05 significance level.
 / Had Accident in the Last Year / Did Not Have an Accident in the Last Year
Uses a cell phone / 25 / 300
Does not use a cell phone / 50 / 400
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Ho: The row and column factors are independent
H1: They are dependent
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I ran a Chi-Sq test on the 2 by 2 data set and got the following:
test stat: Chi-sq = 2.5234
p-value: 0.1122
df = (2-1)(2-1) = 1
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Conclusion: Since the p-value is grater than 5%,
do not reject Ho; the row and column factors are independent.
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Cheers,
Stan H.
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