a A chemist at a pharmaceutical company wants to test the quality of a new batch of microscopes Which of the following best describes a cluster sample of microscopes O O O O The chemist takes a list of the microscopes and selects every 6th microscope until 54 microscopes are selected The chemist forms groups of 9 microscopes based on the laboratories that the microscopes are in Then he randomly chooses 6 groups and selects all of the microscopes in these groups The microscopes in the first shipment that was received are easily accessible So he selects all 54 of the microscopes in this shipment b A facilities supervisor at a sports stadium wants to rate the condition of the seats at the stadium Which of the following best describes a stratified sample of seats The supervisor forms groups of 10 seats based on the sections the seats are in Then she selects all of the seats in 5 randomi chosen groups All of the seats in the VIP section are easily accessible So the supervisor selects the 50 seats in this section The supervisor forms 2 groups of seats based on the dates the seats were last replaced Then she selects 25 seats at random from each group c A botanist at a nursery wants to inspect the health of the plants at the nursery Which of the following best describes a systematic sample of plants The botanist takes a list of the plants and selects every 4th plant until 80 plants are selected O The botanist forms 4 groups of plants based on the ages of the plants in months Then he selects 20 plants at random from each group The botanist assigns each plant a different number Using a random number table he draws 80 of those numbers at random Then he selects the plants assigned to the drawn numbers Every set of 80 plants is equally likely to be drawn using the random number table