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Math Help - confidance interval

  1. #1
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    confidance interval

    3)The data ( in micrometers ) for 20 sampled pipe sections ( saved in the Roughpipe file ) are reproduced in the next table; a minitab analysis of the data appears below.


    1.72 , 2.50 , 2.16 , 2.13 , 1.06 , 2.24 , 2.31 , 2.03 , 1.09 , 1.40

    2.57 , 2.64 , 1.26 , 2.05 , 1.19 , 2.13 , 1.27 , 1.51 , 2.41 , 1.95







    a) locate a 95 % confidence interval for the mean surfaroughness of coated interior pipe on the accompany minitab printout .
    b) would you expect the average surface roughness to be as high as 2.5 micrometers ? explain
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  2. #2
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    Quote Originally Posted by ekbio View Post
    3)The data ( in micrometers ) for 20 sampled pipe sections ( saved in the Roughpipe file ) are reproduced in the next table; a minitab analysis of the data appears below.


    1.72 , 2.50 , 2.16 , 2.13 , 1.06 , 2.24 , 2.31 , 2.03 , 1.09 , 1.40

    2.57 , 2.64 , 1.26 , 2.05 , 1.19 , 2.13 , 1.27 , 1.51 , 2.41 , 1.95







    a) locate a 95 % confidence interval for the mean surfaroughness of coated interior pipe on the accompany minitab printout .
    b) would you expect the average surface roughness to be as high as 2.5 micrometers ? explain
    What have you tried? Where are you stuck?
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