You are in charge of quality control for the production of precision forged steel rods. How large a sample should you inspect each day if you want to be 99% sure that the average length of these rods is no more than .001 inches different from what it is supposed to be? Assume from production records that the standard deviation of rod lengths is .003 inches and that more than a thousand rods

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Chapter1: Starting With Matlab
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        You    are    in    charge    of    quality    control    for    the    production    of    precision    forged    steel    rods.        How    large    
a    sample    should    you    inspect    each    day    if    you    want    to    be    99%    sure    that    the    average    length    of    these    
rods    is    no    more than    .001    inches    different    from    what    it    is    supposed    to    be?        Assume    from    production    
records    that    the    standard    deviation    of    rod    lengths    is    .003    inches    and    that    more    than    a    thousand    rods    
are    produced    each    day.

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