Fowle marketing research, inc., bases charges to a client on the assumption that telephone surveys can be completed in a mean time of 15 minutes or less. if a longer mean survey time is necessary, a premium rate is charged. suppose a sample of 35 surveys shows a sample mean of 17 minutes. use = 4 minutes. is the premium rate justified? click on the datafile logo to reference the data.

Acompany manufactures three types of cabinets. it makes 110 cabinets each week. in the first week, the sum of the number of type-1 cabinets and twice the number of type-2 cabinets produced was 10 more than the number of type-3 cabinets produced. the next week, the number of type-1 cabinets produced was three times more than in the first week, no type-2 cabinets were produced, and the number of type-3 cabinets produced was the same as in the previous week.