2. A valve manufacturer produces a butterfly valve composed of two semicircular plates on a common spindle that is used to permit flow in one direction only. The semicircular plates are supplied by a vendor with specifications that the plates be 2.37 millimeters thick and have a tensile strength of five pounds per millimeter. A random sample of 20 such plates is taken. Electronic calipers are used to measure the thickness of each plate. A universal testing machine was used to test the tensile strength. The sample data are found Below. a. Determine, with 95% confidence, if mean tensile strength is less than five pounds per millimeter. Use the critical value approach. b. Are more than half of plates thicker than 2.37? Use the p-value approach with 95% confidence. Thickness Strength 2.4066 4.9175 2.1328 4.8067 2.5937 5.1246 2.1933 4.7555 2.4579 4.7233 2.0665 4.3934 2.1994 4.4609 2.4575 4.7377 2.6724 4.3407 2.2738 4.9487 2.5392 4.4265 2.7956 4.3583 2.1228 4.5608 2.2055 4.8207 2.4359 4.7769 2.3353 5.2468 2.3238 4.8706 2.5267 4.5138 2.2146 4.4402 2.2699 4.6548

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2. A valve manufacturer produces a butterfly valve composed of two
semicircular plates on a common spindle that is used to permit flow in
one direction only. The semicircular plates are supplied by a vendor with
specifications that the plates be 2.37 millimeters thick and have a tensile
strength of five pounds per millimeter. A random sample of 20 such
plates is taken. Electronic calipers are used to measure the thickness of
each plate. A universal testing machine was used to test the tensile
strength. The sample data are found Below. 


a. Determine, with 95% confidence, if mean tensile strength is less than five pounds per
millimeter. Use the critical value approach.
b. Are more than half of plates thicker than 2.37? Use the p-value approach with 95%
confidence. 

Thickness Strength
2.4066 4.9175
2.1328 4.8067
2.5937 5.1246
2.1933 4.7555
2.4579 4.7233
2.0665 4.3934
2.1994 4.4609
2.4575 4.7377
2.6724 4.3407
2.2738 4.9487
2.5392 4.4265
2.7956 4.3583
2.1228 4.5608
2.2055 4.8207
2.4359 4.7769
2.3353 5.2468
2.3238 4.8706
2.5267 4.5138
2.2146 4.4402
2.2699 4.6548
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