Question
A study investigated if cell phone use impacted student drivers' reaction times. There were two groups: 29 students were assigned to the cell phone group
A study investigated if cell phone use impacted student drivers' reaction times. There were two groups: 29 students were assigned to the cell phone group while 29 students were assigned to the control group. The experiment measured the response time to traffic lights; for the cell phone group, the mean was 588.1 with a standard deviation of 87.1 and for the control group, the mean was 531.3 with a standard deviation of 68.2. Construct a 90% confidence interval for the difference in mean response times between the cell phone and control groups.
Point Estimate:
x bar
p hat
x bar 1 - x bar 2
p1 - p2
=
Margin of Error: E =(round to 4 decimal places)
Lower Limit:(round to 4 decimal places)
Upper Limit:(round to 4 decimal places)
We are% confident that the true
population mean
population proportion
difference in population means
difference in population proportions
is betweenand.
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