Seventy-Five College Students Took Part in a Study Initiated by a Large

question 35

Multiple Choice

Seventy-five college students took part in a study initiated by a large computer manufacturer.The company is designing a new type of laptop computer and has created prototypes of it with two different keyboard designs.They are also including the current design of the laptop in the experiment.Each of the students was randomly assigned to one of the three types of computers.The students were asked to spend 15 minutes on one of the computers,performing several tasks (typing words,numbers,making corrections,etc. ) .The ease of use of the keyboard was then rated on a five-point scale by having the students fill out a short questionnaire.Which of the following basic principles of statistical design was not used in this experiment?

• A)Control
• B)Randomization
• C)Repetition
• D)Blinding

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