season for this is that a drivers reaction time may slow dow

season for this is that a driver\'s reaction time may slow down when he or she is talking on the phoe Researchers at the Miami University measured the reaction times of a sample of drivers who phone. Half the sample was tested while on the phone and the other half while not on Minitab output provided below and =0.05. Preblem 4 (25 eroblem 4 (25 points) Recent studies seem to indicate that using a cell phone while driving is dangerous One Page 5 of9 owned a cell the phone. Use the Phone Not on phone population 1) .6457 ,-6009 0528 n2 = 145 0450 n 125 Pooled variance t-test Two-sample 7 tor Phone va ot Mean StDev SE Nean Phone 123 .6457 0.04500.0040 Not 145 0.6009 0.0528 .0044 Ditterence-mu (Phone)-ma (Not) Estimate for difference: 0.04479 95% lower bound for ditteronce : 0.03485 T-Test ofdifference (v,n: t-vaice-7,ee-value . 0.000 or-a Both use Pooled StDev -0.0493 Separate variance t-test Two-sample 7 for Phone vs Not N Nean StDev SE Mean Phone 125 0.6457 0.0450 0.0040 Not 145 0.6009 0.0528 0.0044 Difference mu (Phone)mu (Not) Estimate for difference: 0.04479 95% lower bound for difference : 0.03497 T-Test of difference-0 (vs >): T-value-7.53 P-value-0.000 D“ 267 Test for Equal Variances 95% Bonferroni confidence intervals for standard deviation stDev Lower Phone 125 0.0393878 0.0450127 0.0524256 Not 145 0.0465795 0.0527513 0.0607238 P-Test (Normal Distribution) Test statistic - 0.73, p-value 0.070

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