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Statistics for The Behavioral

Statistics

Quiz 4 :

Some Key Ingredients for Inferential Statistics: the Normal Curve, Sample Versus Population, and Probability

Quiz 4 :

Some Key Ingredients for Inferential Statistics: the Normal Curve, Sample Versus Population, and Probability

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A person received a test score that was in the top 20% of everyone who has taken the test. The test scores are normally distributed. This person's Z score must be at least:
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Answer:

B

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John attained a score of 65 on his stats exam. The mean for the class was a 70 with a SD of 10. What percentage of students scored below and above John?
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Answer:

A

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The mean score on a creativity test is 20 and the standard deviation is 5. The distribution is normal. Using the percentage approximations for the normal curve, how many people would attain a score between 15 and 25?
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Answer:

D

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What IQ score would a person need to be in the top 5% of the general population? Assume M = 100 and SD = 16.
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The _____________ explains why many distributions tend to be close to normal in the real world.
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On a normal curve, what percentage of scores fall between a Z score of 1.29 and a Z score of 1.49?
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A person received a score of 4.78 on a test. This turned out to be a Z score of +1.5. What percentage are above this score? Assume a normal distribution.
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What Z score would a person need to be in the 4% of his or her class on a particular test? Assume a normal distribution.
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A person received a test score that is in the top 32% and the test scores follow a normal curve. This person's Z score must be at least:
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If you were looking at a graph of a normal distribution, which of the following would best describe it?
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Carrie attained a score of 650 on the verbal section of her SAT. The mean grade was a 500 with a standard deviation of 100. What percentage of test takers scored below and above Carrie?
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The normal curve table shows percentages of scores:
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Using the percentage approximations for the normal curve, what percentage of scores are between the mean and one standard deviation below the mean?
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A particular nation has a human rights score of 41, which equals a Z score of 1.3. What is the percentage of nations above this score? (Assume a normal distribution.)
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The mean score on a political attitude scale is 5 and the standard deviation is 2. The distribution is normal. Using the percentage approximations for the normal curve, how many people would get a score between 5 and 9?
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What Z score would a person need to be in the top 5%? Assume a normal distribution.
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If a person has an IQ of 130, approximately what percentage of people have higher IQs? Assume M = 100 and SD = 16.
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Distributions observed in nature and research commonly approximate:
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Jake's Z score for running ability is .60. What is Jake's raw score (assuming M =100 and SD = 7).
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A person has a score that is in the bottom 42% of the scores. What is the highest Z score this person could have? (Assume a normal distribution.)
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