The use of cellular phones in automobiles has increased dramatically in the last
ID: 2909159 • Letter: T
Question
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 0.05 significance level. Had Accident in Did Not Bave an Accident in Uses a cell phone Does not use a cell phone the Last Year 34 67 the Last Year 309 366 Ho: There is no relationship between phone use and accidents H: There is a relationship between phone use and accidents State the decision rule using 0.05 significance level. (Round your answer to 3 decimal places.) Rejoct HO If chi-square Compute the value of chi-square. (Round your answer to 3 decimal places.) What is your decision regarding Ho? sufficient nce to conclude that a relationship exists between phone use and accidentsExplanation / Answer
aplha= 0.05
df = (r-1)*(c-1) = 1
Critical Value 3.841458821 =CHISQ.INV.RT(0.05,1)
reject ho if chi sq > 3.841
Chi-Square Test Statistic = sum(Oi-Ei)^2/Ei = 5.228
Reject Ho, there is sufficient evidence to conclude that there is a relationship between phone use and accidents.
Observed Frequencies Column variable Row variable C1 C2 Total R1 34 309 343 R2 67 366 433 Total 101 675 776Related Questions
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