A machine fills bottles with 64 fluid ounces of Iiquid. The quality-control manager determines that the fill levels are normally distributed with a mean of 64 ounces and a standard deviation of 0.42 ounce. He has an engineer recalibrate the machine in an attempt to lower the standard deviation. After the recalibration, the quality-control nanager randomly selects 19 bottles from the line and determines that the standard leviation is 0.38 ounce. Is there less variability in the filling machine? Use a=0.01 level of significance. What does it mean for the quality-control engineer to make a Type I error? A Type Il error?

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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A machine fills bottles with 64 fluid ounces of liquid. The quality-control manager
determines that the fill levels are normally distributed with a mean of 64 ounces and a
standard deviation of 0.42 ounce. He has an engineer recalibrate the machine in an
attempt to lower the standard deviation. After the recalibration, the quality-control
manager randomly selects 19 bottles from the line and determines that the standard
deviation is 0.38 ounce. Is there less variability in the filling machine? Use a=0.01 level
of significance. What does it mean for the quality-control engineer to make a Type I
error? A Type II error?
Transcribed Image Text:A machine fills bottles with 64 fluid ounces of liquid. The quality-control manager determines that the fill levels are normally distributed with a mean of 64 ounces and a standard deviation of 0.42 ounce. He has an engineer recalibrate the machine in an attempt to lower the standard deviation. After the recalibration, the quality-control manager randomly selects 19 bottles from the line and determines that the standard deviation is 0.38 ounce. Is there less variability in the filling machine? Use a=0.01 level of significance. What does it mean for the quality-control engineer to make a Type I error? A Type II error?
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