Answered: A quality control officer compares the…

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

A quality control officer compares the average lifetime of four different brandsof hand phones. For each of the brand, 5 hand phone was used to calculate theaverage lifetime in minutes. The results are given as follow

V =756.55 W=3 X=16 Y=5.4 Z= 46.7006

i)Assuming the populations are normally distributed, determine which
average lifetime of the hand phones is significantly different at ? =
0.05?

Transcribed Image Text:Hand phone Brand A Brand B Brand C Brand D Mean lifetime of 42.2 five (5) hand phone (in minutes) 34.8 44.8 52 Standard Deviation 1.9235 3.4205 1.9235 1.5811 ΑNOVA Source of Variation SS Between Groups Within Groups df (W) (X) MS F (V) 252.1833 (Z) 86.4 (Y) Total 842.95 19

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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