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" in 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? Is it 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. If the students are identified as A, B, C, D, 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) s the study in (c) an observational study, completely randomized experiment or randomized complete block experiment?

Explanation / Answer

It is a completely randomised experiment

Which is the primary variable? Ans. Possession of hand free cell phone Is it categorical or quantitative? Ans. Categorical Which variable is the outcome? Ans. Reaction after the car ahead brakes Is it categorical or quantitative? Ans. Categorical LABELLING Serial Number Alphabets random numbers ( R ) R/8 floor(R/8) R - Floor(R/8)*8 Letters Accept/Reject The control Group of 4 0 A 69 8.625 8 5 F Accept F 1 B 5 0.625 0 5 F Reject A 2 C 16 2 2 0 A Accept B 3 D 48 6 6 0 A Reject H 4 E 17 2.125 2 1 B Accept 5 F 87 10.875 10 7 H Accept 6 G 17 2.125 2 1 B Reject 7 H 40 5 5 0 A Reject

It is a completely randomised experiment

LABELLING Serial Number Alphabets Serial Number Alphabets 0 A 0 E random numbers ( R ) R/4 floor(R/8) R - Floor(R/8)*8 Letters The control Group of 2 1 B 1 F 69 17.25 17 1 B B 2 C 2 G 5 1.25 1 1 B A 3 D 3 H 16 4 4 0 A 48 12 12 0 A random numbers ( R ) R/4 floor(R/8) R - Floor(R/8)*8 Letters The control Group of 2 17 4.25 4 1 F F 87 21.75 21 3 H H 17 4.25 4 1 F 40 10 10 0 E it is a completely randomised block experiment

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