Answered: A psychologist claims that the mean age…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A psychologist claims that the mean age at which children start walking is 20 months. ZkH3 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 18 months with a standard deviation of 4 months. It is known that the
ages at which all children start walking are approximately normally distributed. Test that the mean age
at which all children start walking is less than 20 months at 5% level of significance.

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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