Mathematics, 27.11.2019 20:31 ljoslin21

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?

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