A city police chief decides to do an annual review of the police department by checking the number of monthly complaints. If the total number of complaints in each of the 12 months were 15, 18, 13, 12, 16, 20, 5, 10, 9, 11, 8, and 3 and the police chief wants a 90% confidence level, are the complaints in control?

Confidence Level

A statistical measure that quantifies the probability of a parameter lying within a specified range of values, often used in the context of confidence intervals.

Control

In management, it refers to the process of monitoring activities to ensure they are being accomplished as planned and correcting any significant deviations.