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Question: Part of the assembly line will need adjusting if the consistency of the injected plastic becomes either too viscous or not viscous enough as compared with a value (56.00) your engineers consider reasonable. You will decide to adjust only if you are convinced that the system is "not in control," that is, there is a real need for adjustment. The average viscosity for 13 recent measurements was 51.22 with a standard error of 3.18.

a. Identify the null and research hypotheses for a two-sided test, using both words and mathematical symbols.

b. Perform a two-sided test at the 5% significance level and describe the result.

c. Perform a two-sided test at the 1% significance level and describe the result.

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Statistics and Probability, Statistics

Category:- Statistics and Probability
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