Tessler Electric utility requires service operators to answer telephone calls from customers in an average time of 0.1 minute or less. A sample of 25 actual operator times was drawn, and the results are given in the following table. In addition, operators are expected to determine customer needs and either respond to them or refer the customer to the proper department within 0.5 minute. Another sample of 25 times was taken for this job component and is also given in the table. If these

2 variables can be considered to be independent, are the average times taken to perform each component statistically different from the standards? Component Mean Time Standard Deviation Answer 0.1023 0.0183 Service 0.5290 0.0902