Answered: 1. ??: ? = 90 ??: ? ≠ 90 The sample…

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

1. ??: ? = 90
??: ? ≠ 90
The sample mean is 69 and sample size is 35. The population follows a
normal distribution with standard deviation 5. Use ? = 0.05.

2. A survey reports the mean age at death in the Philippines is 70.95 years
old. An agency examines 100 randomly selected deaths and obtains a
mean of 73 years with standard deviation of 8.1 years. At 1% level of
significance, test whether the agency’s data support the alternative
hypothesis that the population mean is greater than 70.95.

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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