1. Two machines are used for filling plastic bottles with a net volume of 16.0 ounces. The fill volume can be assumed normal, with a standard deviation ₁ = 0.020 and ₂ = 0.025 ounces. A quality engineer suspects that both machines fill to the same mean net volume, whether or not this volume is 16.0 ounces. A random sample of 10 bottles taken from the output of each machine is as follows; Machine 1 Machine 2 16.03 16.01 16.02 16.03 16.04 15.96 15.97 16.04 16.05 15.98 15.96 16.02 16.05 16.02 16.01 16.01 16.02 15.99 15.99 16.00 a. Do you think the engineer is correct? Use a = 0.05. What is the P-value for this test? b. Calculate a 95% confidence interval on the difference in means. Provide a practical interpretation of this interval. C. What is the power of the test in part (a) for a true difference in means of 0.04? d. Assuming equal sample sizes, what sample size should be used to ensure that ß = 0.05 if the true difference in means is 0.04? Assume a = 0.05.

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1. Two machines are used for filling plastic bottles with a net volume of 16.0 ounces. The fill volume can
be assumed normal, with a standard deviation ₁ = 0.020 and ₂ = 0.025 ounces. A quality engineer
suspects that both machines fill to the same mean net volume, whether or not this volume is 16.0 ounces.
A random sample of 10 bottles taken from the output of each machine is as follows;
Machine 1
Machine 2
16.03 16.01 16.02 16.03
16.04 15.96 15.97
16.04
16.05 15.98 15.96
16.02
16.05 16.02 16.01
16.01
16.02
15.99 15.99
16.00
a. Do you think the engineer is correct? Use a = 0.05. What is the P-value for this test?
b. Calculate a 95% confidence interval on the difference in means. Provide a practical
interpretation of this interval.
C. What is the power of the test in part (a) for a true difference in means of 0.04?
d. Assuming equal sample sizes, what sample size should be used to ensure that ß = 0.05 if the true
difference in means is 0.04? Assume α = 0.05.
Transcribed Image Text:1. Two machines are used for filling plastic bottles with a net volume of 16.0 ounces. The fill volume can be assumed normal, with a standard deviation ₁ = 0.020 and ₂ = 0.025 ounces. A quality engineer suspects that both machines fill to the same mean net volume, whether or not this volume is 16.0 ounces. A random sample of 10 bottles taken from the output of each machine is as follows; Machine 1 Machine 2 16.03 16.01 16.02 16.03 16.04 15.96 15.97 16.04 16.05 15.98 15.96 16.02 16.05 16.02 16.01 16.01 16.02 15.99 15.99 16.00 a. Do you think the engineer is correct? Use a = 0.05. What is the P-value for this test? b. Calculate a 95% confidence interval on the difference in means. Provide a practical interpretation of this interval. C. What is the power of the test in part (a) for a true difference in means of 0.04? d. Assuming equal sample sizes, what sample size should be used to ensure that ß = 0.05 if the true difference in means is 0.04? Assume α = 0.05.
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