Social psychologists at the University of California at Berkeley wanted to study the effect that staring at drivers would have on driver behavior (Ellsworth, Carlsmith, and Henson, 1972). In a randomized experiment, the researchers either stared or did not stare at the drivers of automobiles stopped at a campus stop sign. The researchers timed how long it took each driver to proceed from the stop sign to a mark on the other side of the intersection. Suppose that the random sample of crossing times, in seconds, gave the following output: Group N Mean StDev No Stare 14 6.63 1.360 Stare 13 5.59 0.822 Construct a 95% confidence interval for the difference in stop times.
Social psychologists at the University of California at Berkeley wanted to study the effect that staring at drivers would have on driver behavior (Ellsworth, Carlsmith, and Henson, 1972). In a randomized experiment, the researchers either stared or did not stare at the drivers of automobiles stopped at a campus stop sign. The researchers timed how long it took each driver to proceed from the stop sign to a mark on the other side of the intersection. Suppose that the random sample of crossing times, in seconds, gave the following output:
Group N Mean StDev
No Stare 14 6.63 1.360
Stare 13 5.59 0.822
Construct a 95% confidence interval for the difference in stop times.
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