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Slide 4- 1 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Active Learning Lecture Slides For use with Classroom Response Systems Elementary Statistics: Picturing the World Fourth Edition by Larson and Farber Chapter 5: Normal Probability Distributions

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Slide 5- 2 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Find the probability using the standard normal distribution. P(z < 1.49) A. 0.9319 B. 0.0681 C. 0.6879 D. 0.3121

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Slide 5- 3 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Find the probability using the standard normal distribution. P(z < 1.49) A. 0.9319 B. 0.0681 C. 0.6879 D. 0.3121

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Slide 5- 4 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Find the probability using the standard normal distribution. P(z ≥ –2.31) A. 0.0104 B. 0.0087 C. 0.9896 D. 0.9913

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Slide 5- 5 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Find the probability using the standard normal distribution. P(z ≥ –2.31) A. 0.0104 B. 0.0087 C. 0.9896 D. 0.9913

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Slide 5- 6 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Find the probability using the standard normal distribution. P(–2.14 < z < 0.95) A. 0.1170 B. 0.0681 C. 0.1873 D. 0.8127

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Slide 5- 7 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Find the probability using the standard normal distribution. P(–2.14 < z < 0.95) A. 0.1170 B. 0.0681 C. 0.1873 D. 0.8127

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Slide 5- 8 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. Find the probability a randomly selected person has an IQ score greater than 120. A. 0.9082 B. 0.0918 C. 0.6293 D. 0.3707

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Slide 5- 9 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. Find the probability a randomly selected person has an IQ score greater than 120. A. 0.9082 B. 0.0918 C. 0.6293 D. 0.3707

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Slide 5- 10 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. Find the probability a randomly selected person has an IQ score between 100 and 120. A. 0.9082 B. 0.0918 C. 0.4082 D. 0.5918

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Slide 5- 11 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. Find the probability a randomly selected person has an IQ score between 100 and 120. A. 0.9082 B. 0.0918 C. 0.4082 D. 0.5918

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Slide 5- 12 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Find the z-score that has 2.68% of the distribution’s area to its right. A. z = 0.9963 B. z = –1.93 C. z = –0.0037 D. z = 1.93

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Slide 5- 13 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Find the z-score that has 2.68% of the distribution’s area to its right. A. z = 0.9963 B. z = –1.93 C. z = –0.0037 D. z = 1.93

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Slide 5- 14 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. What IQ score represents the 98 th percentile? A. 131 B. 69 C. 113 D. 145

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Slide 5- 15 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. What IQ score represents the 98 th percentile? A. 131 B. 69 C. 113 D. 145

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Slide 5- 16 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley A population has a mean of 80 and a standard deviation of 12. Samples of size 36 are selected from the population. Describe the sampling distribution of. A. Normal, B. Normal, C. Approximately normal, D. Approximately normal,

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Slide 5- 17 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley A population has a mean of 80 and a standard deviation of 12. Samples of size 36 are selected from the population. Describe the sampling distribution of. A. Normal, B. Normal, C. Approximately normal, D. Approximately normal,

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Slide 5- 18 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley American children watch an average of 25 hours of television per week with a standard deviation of 8 hours. A random sample of 40 children is selected. What is the probability the mean number of hours of television they watch per week is less than 22? A. 0.3520 B. 0.0089 C. 0.9911 D. 0.6480

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Slide 5- 19 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley American children watch an average of 25 hours of television per week with a standard deviation of 8 hours. A random sample of 40 children is selected. What is the probability the mean number of hours of television they watch per week is less than 22? A. 0.3520 B. 0.0089 C. 0.9911 D. 0.6480

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Slide 5- 20 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Use a correction for continuity to convert the following interval to a normal distribution interval. The probability of getting at least 80 successes A. x > 80.5 B. x > 79.5 C. x < 80.5 D. x < 79.5

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Slide 5- 21 Copyright © 2007 Pearson Education, Inc. Publishing as Pearson Addison-Wesley Use a correction for continuity to convert the following interval to a normal distribution interval. The probability of getting at least 80 successes A. x > 80.5 B. x > 79.5 C. x < 80.5 D. x < 79.5

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