Answered: A psychologist claims that the mean age…

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section: Chapter Questions

Problem 22SGR

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A psychologist claims that the mean age at which children start walking is 17 months. latif wanted to check if this claim is true. He took a random sample of 20 children and found that the mean age at which these children started walking was 15 months. It is known that the ages at which all children start walking are approximately normally distributed with a standard deviation of 3 months. By using the p-value approach, test that the mean age at which all children start walking is less than 17 months at 5% level of significance with mentioning all six steps.

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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.

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