Dr. Cooper is interested in the amount of time adolescents s…

Dr. Cooper is interested in the amount of time adolescents spend in after-school activities. She decides to start with a group of 13-year-olds and follow them until they are 18 years old. She intends to meet with them at three different intervals over the next 6 years. Which research design is Dr. Cooper using?

George works as the human resource manager at Maddy’s Confec…

George works as the human resource manager at Maddy’s Confectionaries. It was mandatory for his subordinates to obtain his signature on every document related to the hiring of a new employee. When he realized that this was increasing the duration of the hiring process, he told his subordinates that they no longer needed his signature unless the hire involved extraordinary circumstances. This is an example of: 

Assume a disk subsystem with the following components and MT…

Assume a disk subsystem with the following components and MTTF: • 10 disks, each rated at 1,000,000-hour MTTF• 1 ATA controller, 600,000-hour MTTF• 1 power supply, 100,000-hour MTTF• 1 fan, 400,000-hour MTTF• 1 ATA cable, 2,000,000-hour MTTF Using the simplifying assumptions that the lifetimes are exponentially distributed and that failures are independent, compute the MTTF of the system as a whole.