The mean of a certain production process is known to be 50 with a standard deviation of 2.5.the production manager may welcome any change in mean valve towards higher side but would like to safeguard against decreasing values of mean. He takes a simple of 12 items that gives. A mean value of 48.5.what inference should the manager take for the production process on the basis of sample results?use 5% level of significance for the purpose.
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•Solution: Taking the mean value of the population to be 50, we may write:•H0: μ H0 =50•Ha: μ H0 <50
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