Answered: A manufacturing rm has been averaging…

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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A manufacturing rm has been averaging 28.4 orders per week for several years with a standard

deviation of 2.2. Recently however, the number of orders appears to have fallen. Suppose the rm's

production manager randomly samples 40 weeks and nds a sample mean of 27.9 orders. To test

at = 0:01 whether the average number of orders has dropped the appropriate null and alternative

hypotheses are

a. Null hypothesis (H0)

b. Alternative hypothesis (HA)

c. The correct decision rule is

Reject H0 if

d. The value (correct to 2dp) of the test statistic for testing this hypothesis is (do not include t =; z =,

etc)

e. Should we reject H0? The conclusion will be:

There is evidence at = 0:01 to conclude that the average number of orders

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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