Mathematics
Mathematics, 25.06.2019 06:30, kelly3215

Abearing used in an automotive application is required to have a nominal inside diameter of 1.5 inches. a random sample of 25 bearings is selected and the average inside diameter of these bearings is 1.4975 inches. bearing diameter is known to be normally distributed with standard deviation inch. (a) test the hypotheses versus using the true mean hole diameter.

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Mathematics, 24.06.2019 09:20, xwilliams83
Amanufacturing process is designed to produce ball bearings with a diameter of 0.620 cm. the standard deviation of all ball bearing diameters is 0.009 cm. every day a random sample of 40 ball bearings is selected and their diameters are measured. if the mean diameter from this sample falls outside of a given range, then the management will stop production to make adjustments. for the range 0.619 cm to 0.621 cm, find the probability that the management will stop production unnecessarily. (hint: find the probability that a sample’s mean will have a value inside this range when the population mean actually is 0.620 cm, and then use complements to find the probability that a sample mean’s value is outside that range.)
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Mathematics, 26.09.2019 20:30, book0001
Abearing used in an automotive application is required to have a nominal inside diameter of 1.5 inches. a random sample of 25 bearings is selected and the average inside diameter of these bearings is 1.4975 inches. bearing diameter is known to be normally distributed with standard deviation inch. (a) test the hypotheses versus using the true mean hole diameter significantly different from 1.5 in. at alpha equals 0.01. (b) what is the p-value for the test in part (a)
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Mathematics, 15.10.2019 05:00, fernandaElizondo
Abearing used in an automotive application is required to have a nominal inside diameter of 1.5 inches. a random sample of 25 bearings is selected and the average inside diameter of these bearings is 1.4975 inches. bearing diameter is known to be normally distributed with standard deviation inch. (a) test the hypotheses versus using the true mean hole diameter significantly different from 1.5 in. at alpha equals 0.01. (b) what is the p-value for the test in part (a)
Answers: 2
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Mathematics, 30.10.2019 03:31, yam44
Alarge box contains 10,000 ball bearings. a random sample of 120 is chosen. the sample mean diameter is 10 mm, and the standard deviation is 0.24 mm. true or false: a. a 95% confidence interval for the mean diameter of the 120 bearings in the sample is 10 ± (1.96)(0.24)/√ 120. b. a 95% confidence interval for the mean diameter of the 10,000 bearings in the box is 10 ± (1.96)(0.24)/√120. c. a 95% confidence interval for the mean diameter of the 10,000 bearings in the box is 10 ± (1.96)(0.24)/√10,000.
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