Cinturon Corporation produces high-quality leather belts. The company’s plant in Boise uses a standard costing system and has set the following standards for materials and labor:

Leather (3 strips @ $6)............................................ $18.00
Direct labor (0.75 hr. @ $16) ....................................12.00
Total prime cost .......................................................$30.00

During the first month of the year, the Boise plant produced 92,000 belts. Actual leather purchased was 287,500 strips at $5.40 per strip. There was no beginning or ending inventories of leather. Actual direct labor was 78,200 hours at $16.50 per hour.

Required:
1. Break down the total variance for materials into a price variance and a usage variance using the columnar and formula approaches.
2. Suppose the Boise plant manager investigates the materials variances and is told by the purchasing manager that a cheaper source of leather strips had been discovered and that this is the reason for the favorable materials price variance. Quite pleased, the purchasing manager suggests that the materials price standard be updated to reflect this new, less expensive source of leather strips. The plant manager responded that more information was needed before deciding to update the price standard. What additional information would prove to be useful to the plant manager? What does this tell you about the diagnostic role of data analytics?