please use the calculator method An electric company wishes to estimate the true mean lifetime of its bulbs.It desires to be 98% sure that the true mean is estimated within 25 hours. If the lifetimes have standard deviation 150 hours, how many bulbs must be tested to achieve the desired accuracy? Times New Rom - 22 - A A AavAaBbC AABBC AaBbC AaBbC AABBC AaBbCIU abx, x A-三三=| m、|、出T Heading 1 T Heading 2 Tading 3 T Heading 4 T Heading 5 T NormFontParagraphStylesSOME COMMON VALUES OF Z*Confidence LevelTail LevelZ*60%.20.8480%.101.2890%.051.64595%.0251.9696%.022.0598%.012.3399%.0052.576DFocussearch

From the provided information, Population standard deviation (σ) = 150 hours Margin of error (E) =…

Answered: An electric company wishes to estimate…

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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please use the calculator method

An electric company wishes to estimate the true mean lifetime of its bulbs.

It desires to be 98% sure that the true mean is estimated within 25 hours. If the lifetimes have standard deviation 150 hours, how many bulbs must be tested to achieve the desired accuracy?

Times New Rom - 22 - A A Aav
AaBbC AABBC AaBbC AaBbC AABBC AaBbC
IU ab
x, x A
-三三=| m、|、出
T Heading 1 T Heading 2 Tading 3 T Heading 4 T Heading 5 T Norm
Font
Paragraph
Styles
SOME COMMON VALUES OF Z*
Confidence Level
Tail Level
Z*
60%
.20
.84
80%
.10
1.28
90%
.05
1.645
95%
.025
1.96
96%
.02
2.05
98%
.01
2.33
99%
.005
2.576
DFocus
search

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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