Answered: The mean construction time for a…

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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The mean construction time for a standard two-car garage by Arrowhead Construction Company is 3.5 days. The time for the construction process follows the normal distribution. The construction process is
modified through the use of “precut and assembled roof trusses” rather than onsite construction of roof rafters. This should shorten the construction time. A sample of 15 garages had a mean time of 3.20 days with a standard deviation of 0.7 days. Does use of the “precut and assembled roof trusses” decrease the construction time? Follow the five-step hypothesis testing procedure using the 0.05 significance level

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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