Cell phones and driving. Does talking on a hands-free cell phone distract driver

Question

Cell phones and driving. Does talking on a hands-free cell phone distract drivers? Undergraduate students .drove a high-fidelity driving simulator equipped with a hands-free cell phone. The car ahead brakes: how quickly does the subject respond? Four students (the control group) simply drove. Another 4 (the experimental group) talked on the cell phone while driving. a) which variable is the primary factor? sit categorical or quantitative? b) which variable is the outcome? Is it categorical or quantitative? c) You must divide the 8 student subjects into two groups of 4. lf the students are identified as Ar B, CD, E, F, G, H. Use the following random digits to assign 4 students to the control group. 69051 64817 87174 09517 84534 06489 87201 97245 Step 1: Label. Step 2: Table. d) is the study in (c) an observational study, completely randomized experiment or randomized complete block experiment?

Explanation / Answer

a) Exprimental group is the primary factor. It is categorical.

b) Control group is the outcome. It is also quantitative.

c) Step 1: Label

      A    B C D E F G    H

69051 64817    87174 09517 84534 06489 87201 97245   

   Step 2: Table

d) It is radomized complete block expriment.

e) Step 1: Lable

Male:              A B C     D

                  72771       11672    64647 94354

Female:          E    F G    H   

67492 42904 45994    42538

Step 2: Table

f) It is completely randomized experiment.

      Control group      A       B      C     D      Exprimental group      E       F      G     H

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