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Name: 1. Pyrometric cones of different composition are supplied to the ceram
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Description: 1. Pyrometric cones of different composition are supplied to the ceramic industry to use in measuring temperatures in kilns. Different cones are designed to melt at specific temperatures. Suppose a random sample of 40 No. 17 cones had melting temper

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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1. Pyrometric cones of different composition are supplied to the ceramic industry to use in measuring temperatures in kilns. Different cones are designed to melt at specific temperatures. Suppose a random sample of 40 No. 17 cones had melting temperatures with a mean of 1875 degrees and a standard deviation of 54 degrees. Find a 95% CI for the mean melting temperature of the No. 17 cones

2. A speedy oil and lubrication chain surveyed its stores as to the time needed to process a customer. Six customers from each of its 17 stores were selected at random and monitored. The processing times had a mean of 11 minutes with a standard deviation of 5.8 minutes. Find a 95% CI for the mean time needed to process a customer.

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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