Answered: We take a simple random sample of 16…

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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Question

We take a simple random sample of 16 adults and ask them how long they sleep on a
typical night. The sample mean is calculated to be 7.2 hours. Suppose it is known that
the number of hours adults sleep at night follows a normal distribution with standard
deviation 1.8 hours. An 88% confidence interval for the true mean time adults sleep at
night is

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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