(1)A facilities supervisor at a sports stadium wants to rate the condition of the seats at the stadium. Which of the following best describes astratified sampleof seats?

a. The supervisor takes a list of the seats and selects every 3^rd seat until 78 seats are selected

b. All of the seats in the VIP section are easily accessible. So, the supervisor selects 78 seats in this section.

c. The supervisor forms 6groups of seats based on the dates the seats were last replaced. Then, she selects 13 seats at random from each group.

(2)A chemist at a pharmaceutical company wants to test the quality of a new batch of microscopes. Which of the following best describes aconvenience sampleof microscopes?

a. The microscopes in the first shipment that was received are easily accessible. So, he selects all60 of the microscopes in this shipment

b. The chemist assigns each microscope a different number. Using a random number table, he draws60 of those numbers at random, Then, he selects the microscopes assigned to the drawn numbers. Evert set of 60 microscopes is equally likely to be drawn using the random number table.

c. The chemist forms groups of12 microscopes based on the laboratories that the microscopes are in. Then, he randomly chooses 5 groups and selects all the microscopes in these groups.

(3)A botanist at a nursery wants to inspect the health of the plants at the nursery. Which of the following best describes acluster sampleof plants?

a. The botanist forms7 groups of plants based on the ages of the plants (in months). Then, he selects 8 plants at random from each group.

b. The botanist forms groups of8plants based on the heights of the plants. Then, he randomly chooses 7groups and selects all of the plants in these groups.

c. The botanist takes a list of the plants and selects every7^th plant until56 plants are selected.