A study investigated if cell phone use impacted student drivers'reaction times. There were two groups: 29 students were assigned tothe cell phone group while 29 students were assigned to the controlgroup. The experiment measured the response time to traffic lights;for the cell phone group, the mean was 585.1 with a standarddeviation of 88 and for the control group, the mean was 540 with astandard deviation of 65. Construct a 90% confidence interval forthe difference in mean response times between the cell phone andcontrol groups. Point Estimate: = Margin of Error: E = (round to 4decimal places) Lower Limit: (round to 4 decimal places) UpperLimit: (round to 4 decimal places) We are 90 % confident that thetrue is between and .
