Answered: Two suppliers manufacture plastic gear…

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

Two suppliers manufacture plastic gear used in a laser printer. The impact strength of these gears measured in foot-pounds is an important characteristic. A random sample of 10 gears from supplier 1 results in an average of 290 with a standard deviation of 12, while another random sample of 16 gears from the second supplier results in an average of 321 with a standard deviation of 22. Is there evidence to support the claim that supplier 2 provides gears with higher mean impact strength? Use α = 0.05, and assume that both populations are normally distributed.

State the null and alternative hypotheses.

A
(B
(C)
D
1
H: 02 = 2,
H: 02 + 022
H: 02 = 622
H: 02> 02,
1
H: 02 - 02 - 0
H: 021> 022
Ho: 02 = 622
H:02 <022
1

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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