Behavioral Sciences STAT

Mathematics

Quiz 5 :

Describing Data With Z-Scores and the Normal Curve

Quiz 5 :

Describing Data With Z-Scores and the Normal Curve

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When two normal z-distributions are plotted on the same graph, what can we say about the relative frequency of each z-score?
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A

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Which of the following statements accurately describes the sampling distribution of means?
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D

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Given a normal distribution, as z­scores' absolute values increase, those z-scores and the raw scores that correspond to them occur
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B

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For any approximately normal distribution, how can we find the relative frequency of the scores?
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Sally's z-score on a given measure is -2.5, where the population mean is 5 and the standard deviation is 1.5.What is Sally's raw score?
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In a z-distribution, the standard deviation will always be
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A z-score of zero always means
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We can use the standard normal curve as our model for
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Which of the following is not one of the things the relative frequency of z-scores allows us to calculate for corresponding raw scores?
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Your relative standing informs you
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The mean of the sampling distribution of means is always
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To evaluate a person for possible brain damage, a neuropsychologist gives the person a visual memory test and a reading test.To compare the person's performance across these two tests, what should the neuropsychologist do?
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A z­score communicates a raw score's
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Pat's last statistics test score was 72.If the instructor tells Pat the grade distribution was approximately normal, the class mean was 67, and the standard deviation was 3, which of the following is correct?
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The distribution of z-scores is always
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In sampling distributions, all the samples contain sets of raw scores
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You should first transform X to z in all of the following cases except if you seek
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z-scores can be calculated from
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Sampling distributions of means are always
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Chris wants to calculate a z­score for his own height.The average height in the class is 66 inches, and Chris's height is 62 inches.Chris calculated his z­score to be +1.5.What's wrong with his calculation?
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