Explanation Given info: The percentile is P 25 . Calculation: The percentile 25% represents the area of 0.25 to the left of z . Shade the cumulative area of 0.25 to the left of z -score as shown below in Figure (1). Figure (1) Use Table 4: Standard normal distribution to find z score

Elementary Statistics: Picturing the World (7th Edition)

7th Edition

ISBN: 9780134683416

Author: Ron Larson, Betsy Farber

Publisher: PEARSON

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Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

Chapter 5.3, Problem 13E

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To obtain: The z-score that corresponds to the percentile P25 .

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Chapter 5.3, Problem 12E

Chapter 5.3, Problem 14E

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Chapter 5 Solutions

Elementary Statistics: Picturing the World (7th Edition)

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To obtain: The z -score that corresponds to the percentile P 25 .

Solution Summary: The author explains the z -score that corresponds to the percentile P_25 is –0.67.

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To obtain: The z-score that corresponds to the percentile P25 .

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