(a) 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 forms 6 groups of plants based on the ages of the plants (in months). Then, he selects 12 plants at random from each group. The botanist assigns each plant a different number. Using a random number table, he draws 72 of those numbers at random. Then, he selects the plants assigned to the drawn numbers. Every set of 72 plants is equally likely to be drawn using the random number table. The botanist takes a list of the plants and selects every 3rd plant until 72 plants are selected. (b) A chemist at a pharmaceutical company wants to test the quality of a new batch of microscopes. Which of the following best describes a convenience sample of microscopes? The chemist assigns each microscope a different number. Using a random number table, he draws 64 of those numbers at random. Then, he selects the microscopes assigned to the drawn numbers. Every set of 64 microscopes is equally likely to be drawn using the random number table. The microscopes in the first shipment that was received are easily accessible. So, he selects all 64 the microscopes in this shipment. The chemist takes a list of the microscopes and selects every 4th microscope until 64 microscopes are selected. (c) 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 6 groups of seats based on the dates the seats were last replaced. Then, she selects 9 seats at random from each group. The supervisor forms groups of 9 seats based on the sections the seats are in. Then, she selects all of the seats in 6 randomly chosen groups. All of the seats in the VIP section are easily accessible. So, the supervisor selects the 54 seats in this section. O O X