A Researcher Records the Number of Mistakes Made During a Memory

question 22

Multiple Choice

A researcher records the number of mistakes made during a memory skills task.He finds that the probability that participants in this study made 0 mistakes is p = .22; made 1 mistake is p = .30; made 2 mistakes is p = .16; made 3 mistakes is p = .12; and made 4 or more mistakes is p = .25.Is this probability distribution accurate?

• A) Yes, it distributes all possible outcomes for the random variable.
• B) No, one of the outcomes is stated as "or more."
• C) No, the probability distribution does not sum to 1.0.
• D) No, one of the outcomes is stated as "or more" and the probability distribution does not sum to 1.0.

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