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On October 3, 2016 two teams of two went and observed the intersection of Railroad and Pineville. One team went in the morning around 11:00 am and the other team went in the afternoon around 1:00 pm. The teams were observing how many people did or did not use their blinker for their turn and whether or not the direction of the turn( left or right) influenced the decision of the drivers to use their turn signal.
They blocked left and right turns to make sure that any bias regarding direction of turn was taken into account. It was a random sample because they used all cars that entered the intersection and did not separate cars by color and type. The time frame was taken in consideration by using two separate afternoon and morning samples in order to eliminate any bias that may have resulted in only picking one of these time frames, such as traffic patterns and business hours.
There are three possible confounding variables that should be noted. Firstly, the teams of observers on the side of the road could have distracted the subjects while making their turn. Secondly, there was a parade starting at 5:00 pm that day; more cars than usual were most likely out and about that day. Lastly, it was noted that when the cars were waiting for the light to turn green, the first car's use of a blinker usually influenced the rest of the cars waiting in line.
In the morning for left turns, about 42% of cars did not use their turn indicators. For right turns, 41% did not use their turn indicators. In the afternoon they found that for left turns, 38% of cars did not use their turn signals. For right turns, 43% didn't use their blinkers. The net results between the two sessions are 41% of left turners did not use indicators while 59% of vehicles making a left turn did. This was out of a total of 306 vehicles that made a left turn. 42% of the vehicles making a right turn did not use their blinker while only 58% of the vehicles making a right turn did use their turning indicator. This was out of a total of 259 vehicles that had made a right turn at the observed intersection. 566 cars were involved in the study.
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