Figure 17-2

question 281

Multiple Choice

Figure 17-2.John and Michael are roommates.On a particular day,their apartment needs to be cleaned.Each person has to decide whether to take part in cleaning.At the end of the day,either the apartment will be completely clean (if one or both roommates take part in cleaning) ,or it will remain dirty (if neither roommate cleans) .With happiness measured on a scale of 1 (very unhappy) to 10 (very happy) ,the possible outcomes are as follows:
-Refer to Figure 17-2.If this game is played only once,then the most likely outcome is that

• A) John and Michael both clean.
• B) John cleans and Michael does not clean.
• C) Michael cleans and John does not clean.
• D) neither John nor Michael cleans.

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Definitions:

Z Statistic

A type of standard score that indicates how many standard deviations an element is from the mean of its population.

Normal Distribution

A bell-shaped frequency distribution curve that is symmetric about the mean, showing that data near the mean are more frequent in occurrence.

One-tailed Test

A statistical hypothesis test in which the alternative hypothesis specifies a direction of the effect.

One-tailed Hypothesis Test

A statistical test in which the region of rejection is on only one side of the sampling distribution, used when a specific direction for the data is predicted.