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Name: The University of Washington uses thousands of BrightLight fluorescent
Uploaded: 2024-03-20T07:07:12.000Z
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Description: The University of Washington uses thousands of BrightLight fluorescent light bulbs eachyear. A new manufacturer, AmpleLamp, claims that its new brand of bulbs, which costthe same as the brand the university currently uses, has a mean life of 6000 hou

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 University of Washington uses thousands of BrightLight fluorescent light bulbs eachyear. A new manufacturer, AmpleLamp, claims that its new brand of bulbs, which costthe same as the brand the university currently uses, has a mean life of 6000 hours. Theuniversity has never studied how long BrightLight bulbs last and they decided they arecurious to see how long BrightLight bulbs last compared to AmpleLamp bulbs. Theyuniversity decides to conduct a significance test at the .05 significance level. A randomsample of 64 BrightLight bulbs are tested and the mean life time is found to be 5910hours. Both manufacturers report that the standard deviation for the lifespan of a lightis 400 hours. Are the lifespan of the two brands of lights significantly different from eachother? Useα=0.1

(a) Which of the following is theH0? (null)A.H0:μ=6000B.H0:x=6000C.H0:μ=5910D.H0:x=5910E.H0:μ6=6000F.H0:x6=6000G.H0:μ6=5910H.H0:x6=5910I.

(b) Which of the following is the correct formula to compute Test Statistic (TS)? A.6000−5910400/√64 B.5910−6000400/√64 C.6000−591020/√64

D.5910−600020/√64 E. None of these

(d) What is the critical value fromCritical Table?

(e) What is the p-value ?

(f) ConclusionA. RejectH0B. Fail to rejectH0

(g) Interpretation

A. There is enough evidence (from data) in support of AmpleLamp claimthat both have the same mean life.

B. There is not enough evidence (from data) in support AmpleLamp claimthat both have the same mean life.

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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