Question

The Glen Valley Steel Company manufactures steel bars. If the production process is working properly, it turns out steel bars that are normally distributed with mean length of at least 3.2 feet. Longer steel bars can be used or altered but shorter bars must be scrapped. You select a sample of 27 bars, and the mean length is 2.98 feet and the sample standard deviation is 0.25 foot. Do you need to adjust the production equipment if you test the null hypothesis at the 0.05 level of significance, what decision do you make using the critical value approach to hypothesis testing

          The Glen Valley Steel Company manufactures steel bars. If the production process is working properly, it turns out steel bars that are normally distributed with mean length of at least 3.2 feet. Longer steel bars can be used or altered but shorter bars must be scrapped. You select a sample of 27 bars, and the mean length is 2.98 feet and the sample standard deviation is 0.25 foot. Do you need to adjust the production equipment if you test the null hypothesis at the 0.05 level of significance, what decision do you make using the critical value approach to hypothesis testing

The Glen Valley Steel Company manufactures steel bars. If the production process is working properly, it turns out steel bars that are normally distributed with mean length of at least 3.2 feet. Longer steel bars can be used or altered but shorter bars must be scrapped. You select a sample of 27 bars, and the mean length is 2.98 feet and the sample standard deviation is 0.25 foot. Do you need to adjust the production equipment if you test the null hypothesis at the 0.05 level of significance, what decision do you make using the critical value approach to hypothesis testing

Added by Julio C.

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