Answered: Suppose that the IQ scores of…

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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Suppose that the IQ scores of professional athletes are normally distributed. A sample of n=30 professional athletes finds a sample mean of x¯¯¯=104 with a sample standard deviation of s=13. Use this data to find a 95% confidence interval for the population mean μ.

a) The critical value, rounded to three decimal places, is tcrit=

b) The confidence interval, with endpoints rounded to two decimal places, is:

<μ<

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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