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# Statistics for The Behavioral

Statistics

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## Quiz 4 : Some Key Ingredients for Inferential Statistics: the Normal Curve, Sample Versus Population, and Probability

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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Multiple Choice

B

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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A

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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D

What IQ score would a person need to be in the top 5% of the general population? Assume M = 100 and SD = 16.
Multiple Choice
The _____________ explains why many distributions tend to be close to normal in the real world.
Multiple Choice
On a normal curve, what percentage of scores fall between a Z score of 1.29 and a Z score of 1.49?
Multiple Choice
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.
Multiple Choice
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.
Multiple Choice
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:
Multiple Choice
If you were looking at a graph of a normal distribution, which of the following would best describe it?
Multiple Choice
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?
Multiple Choice
The normal curve table shows percentages of scores:
Multiple Choice
Using the percentage approximations for the normal curve, what percentage of scores are between the mean and one standard deviation below the mean?
Multiple Choice
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.)
Multiple Choice
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?
Multiple Choice
What Z score would a person need to be in the top 5%? Assume a normal distribution.
Multiple Choice