Answered: desired information to be accurate…

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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desired information to be accurate within 0.68 decibels?
Show all work.
1. A researcher is interested in estimating the noise levels
in decibels at area urban hospitals. She wants to be 90%
confident that her estimate is correct. If the standard
deviation is 4.13, how large a sample is needed to get the
(A) Find the mean and standard error of the
distribution
(B) Find P(x bar > 73.50)
2. Assume that the population of heights of male college
students is approximately normally distributed with mean
m of 73.63 inches and standard deviation s of 6.73 inches. A
random sample of 97 heights is obtained. Show all
work.

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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