Exam 5: Normal Distributions

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There is only one normal distribution.

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A variable is normally distributed with a hypothesized population mean of 30 and a standard deviation of 4. What percentage of scores are greater than 37?

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Scores for the standard normal distribution are known as z scores.

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One difference between frequency distributions and normal distributions is that ______.

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Moving from learning about frequency distributions to learning about normal distributions coincides with moving from learning about ______ to learning about ______.

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What percentage of z-scores in the standard normal distribution are less than z = -.25?

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"The records of the National Weather Service indicate that, on the average, the city of San Jose receives 14.03 inches of rain each year, with a standard deviation of 5.19 inches." How many inches of rain must fall for a year to be in the top 10%?

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Moving from learning about frequency distributions to learning about normal distributions coincides with moving from learning about ______ to learning about ______.

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The ______ of ______ is equal to ______.

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For a sample of raw scores, you calculate a mean of 15.25 and a standard deviation of 3.19. What is the z-score for a raw score of 11?

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The 'assumption of normality' refers to ______.

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The shaded area in the distribution most closely represents ______. The shaded area in the distribution most closely represents ______.

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"Imagine you are president of a toy company that builds video games. You have determined that the time needed to build these games is normally distributed with a mean of 20 minutes and a standard deviation of 5 minutes." What percentage of video games are built in LESS than 15 minutes?

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The ______ of a normal distribution is represented by ______.

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You can apply the normal curve table to a standardized distribution ______.

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About ______ of z-scores in the standard normal distribution are within ______ standard deviations of the mean.

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The standard normal distribution differs from other normal distributions in that only the standard normal distribution ______.

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Except for ______, the standard normal distribution is similar to other normal distributions.

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For a variable that is normally distributed with a mean of 60 and a standard deviation of 10, approximately ______ of the scores are between ______ and ______.

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"According to the National Center for Health Statistics, in 2005 the average birthweight of a newborn baby was approximately normally distributed with a mean of 119 ounces (7 lb, 7 oz) and a standard deviation of 19 ounces." What percentage of babies weigh between 112 and 144 ounces (7 and 9 lb) at birth?

(Multiple Choice)
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