Answered: The proper operation of typical home…

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

The proper operation of typical home appliances requires voltage levels that do not vary much. Listed below are 8 voltage levels (in volts) at a random house on 8 different days.

120	119.8	120.1	120	119.8
120.2	120	119.9

The mean of the data set is 119.98; the sample standard deviation is 0.139; if the normality plot is not provided you may assume that the voltages are normally distributed.

Construct a 90% confidence interval for the variance (standard deviation) of all voltages in the house.

Procedure:
Assumptions: (select everything that applies)
- Population standard deviation is unknown
- Normal population
- Simple random sample
- Sample size is greater than 30
- Population standard deviation is known
- The number of positive and negative responses are both greater than 10
Unknown parameter:

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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