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Answers to handout 13_1

Answers to handout 13_1 - labeled USER PHONE has a p value...

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Answers to handout 13.1 – Cell Phones and Driving 1. No because participants self-rated themselves as high or low users and were not randomly assigned to these conditions. 3. There is a main effect of User Status – can see this on graph and also by looking at the row labeled User in the bottom table. There you see a p value of .006 for User (the last column in the bottom table is p values. (You’ll notice there is only an effect of user in one of the conditions, the phone condition, but we still say there’s a main effect, we’ll discuss this more below) 4. Yes there is a main effect of phone use, can see on graph or in the bottom table, the row labeled Phone has a p value of .010 5. Yes there is an interaction, lines on graph are not parallel AND in bottom table the row
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Unformatted text preview: labeled USER + PHONE has a p value of .002 So here’s the thing – sometimes main effects show up that are clearly the result of a significant interaction. The results of this study could be stated as follows: “ Talking on the phone while driving resulted in more errors for people who never use a phone while driving but not for those who have experience using phones while driving.” This is a 2 x 2 design, the IV’s are “amount of cell phone use while driving” with two levels (low, high) and the second IV might be called Task and has two levels (with phone, without phone). The DV is the # of times the wheels of the car in the simulator went off the road....
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