The operations manager for Cozine Corporation is concerned with variation in the number of pounds of garbage collected per truck. The manager believes the current truck routing system provides for consistent garbage pickup per truck and is unwilling to reroute the trucks unless the variability, measured by the standard deviation in pounds per truck, is greater than 3,900 pounds. The data file Cozine contains 200 truck weights.

Assuming the data represent a random sample of 200 trucks selected from Cozine’s daily operations, is there evidence the manager needs to change the routes to better balance the loads? Conduct your analysis using a 0.10 level of significance. Be sure to state your conclusion in terms of the operations manager’s decision.