Subjects should be assigned randomly for an experiment like this. Half are assigned to drive while talking on the phone, half are assigned to driving without talking on the phone. The cellphone being the independent variable and driving ability being the dependent. Randomization helps
Subjects should be assigned randomly for an experiment like this. Half are assigned to drive while talking on the phone, half are assigned to driving without talking on the phone. The cellphone being the independent variable and driving ability being the dependent. Randomization helps