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Name: A drug store chain has store located in four cities;there 38 store in
Uploaded: 2024-03-20T07:06:27.000Z
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Description: A drug store chain has store located in four cities;there 38 store in indianapolis ,45 in louisville,80 in st louis and 70 in memphis.pharmacy sales in four cities vary considerable due to completion.the following sales data(in $1000s) are available

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 drug store chain has store located in four cities;there 38 store in indianapolis ,45 in louisville,80 in st louis and 70 in memphis.pharmacy sales in four cities vary considerable due to completion.the following sales data(in $1000s) are available from a sample survey.Each of the cities was considered a separated stratum and a stratified simple random sample of store was taken

Pharmacy sales

Indiana;50.3,41.2,15.7,22.5,26.7,20.8

Louisvillle;48.7,59.8,28.9,36.5,89.8,96.0,77.2,81.3

St.louis;16.7,38.4,51.6,42.7,45.0,59.7,80.0,27.6

Memphis;14.7,88.3,94.2,76.8,35.1,48.2,57.9,18.8,22.0,74.3

A)estimate the mean sale for each city

B)develop an approximate 95% confidence interval for the mean sales in each city

C)develop an approximate 95% confidence interval for mean pharmacy sales drug store chain

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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