The 95% confidence interval for these parts is 56.98 to 57.05 under normal operations. a systematic sample is taken from the manufacturing line to determine if the production process is still within acceptable levels. the mean of the sample is 56.96. what should be done about the production line? the 95% confidence interval for these parts is 56.98 to 57.05 under normal operations. a systematic sample is taken from the manufacturing line to determine if the production process is still within acceptable levels. the mean of the sample is 56.96. what should be done about the production line? keep the line operating as it is close to the confidence interval stop the line as it is outside the confidence interval keep the line operating as it is outside the confidence interval stop the line as it is close to the confidence interval