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A teacher wants to know if nightmares are more common than dreams. She asks for volunteers from her second period class to report how many dreams they had last week. She asks for volunteers from her third period class to report the number of nightmares they had last week. Clearly describe four things wrong with the design of this study.

Sagot :

1 point: There is no hypothesis stated.

1 point: In asking for volunteers, the teacher is taking a nonrandom sample that is probably not representative of the population of interest.

1 point: Neither dreams nor nightmares are operationally defined, so they might be interpreted differently by later researchers.

1 point: The research is not blind. The teacher could influence the results by the way he asked questions.

(choose 2)

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