Answered: The heights (in inches) of adult males…

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 3:
The heights (in inches) of adult males in the United States are believed to be normally distributed with a mean of 69.50 inches. The mean height of a random sample of 35 American adult males was found to be = 70.78 inches with a standard deviation (sx) of 3.95.
A: What type of test should you conduct? One-sample t test, Independent 2-sample t test, Paired sample t test?
B. Should you reject or retain the null hypothesis using an alpha level of 0.05?
C: Construct a 95% confidence interval around the relaxation group’s mean.
D: Calculate a Cohen’s d effect size value.

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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