The following table reflects measurements (in MPa) of the tensile strength of a number of alloy specimens: 15.8 16.7 17.6 7.9 11.4 11.9 13.6 14.9 15.4 15.4 7.5 8.8 11.4 11.9 12.7 14.1 18.5 19.8 10.1 11.4 15.4 19.5 3.1 Test the supplier's claim that these data prove that the mean tensile strength exceeds 12 MPa. Assume that the population is normal and work with a 5% level of significance. 3.2 Find the 99% confidence interval for the true tensile strength of the alloy.

Mathematics For Machine Technology
8th Edition
ISBN:9781337798310
Author:Peterson, John.
Publisher:Peterson, John.
Chapter29: Tolerance, Clearance, And Interference
Section: Chapter Questions
Problem 16A: Spacers are manufactured to the mean dimension and tolerance shown in Figure 29-12. An inspector...
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The following table reflects measurements (in MPa) of the tensile strength of a number of
alloy specimens:
15.8
16.7
17.6 7.9
11.4
11.9
13.6 14.9
15.4
15.4
7.5
8.8
11.4
11.9
12.7 14.1
18.5
19.8
10.1
11.4 15.4 19.5
3.1 Test the supplier's claim that these data prove that the mean tensile strength exceeds 12
MPa. Assume that the population is normal and work with a 5% level of significance.
3.2 Find the 99% confidence interval for the true tensile strength of the alloy.
Transcribed Image Text:The following table reflects measurements (in MPa) of the tensile strength of a number of alloy specimens: 15.8 16.7 17.6 7.9 11.4 11.9 13.6 14.9 15.4 15.4 7.5 8.8 11.4 11.9 12.7 14.1 18.5 19.8 10.1 11.4 15.4 19.5 3.1 Test the supplier's claim that these data prove that the mean tensile strength exceeds 12 MPa. Assume that the population is normal and work with a 5% level of significance. 3.2 Find the 99% confidence interval for the true tensile strength of the alloy.
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