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3 September, 19:03

Nist wants to give the buyer of this iron rod a 90% confidence interval for its true conductivity. what is this interval? (round your answers to three decimal places.)

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  1. 3 September, 19:05
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    The 6 measurements are 10.1, 10.02, 9.89, 10.05, 10.16, 10.21, and 10.11Mean - 10.8333Sample size - 6Standard dev is 0.1Alpha is 1 - 0.90 Z (0.1) = 1.645So the computation would be:Mean ± Z * s/sqrt (n) = 10.0833 ± 1.645*0.1/sqrt (6) = 10.0833± 1.645*0.0408 = 10.0833± 0.0672=10.0161, 10.1505 is the interval. 90% confident that the iron rod’s true conductivity is between 10.0161 and 10.1504 microsiemens per centimeter.
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