(a) A bank analyst wants to ask customers who have a mortgage with the bank about the customers' home-buying experiences. Which of the followingbest describes a random sample of customers?The analyst forms groups of 9 customers based on the cities the customers live in. Then, she selects all of the customers in 6 randomly chosengroups.The analyst spends a day calling mortgage customers and selects the first 54 customers who answer because these customers are easilyaccessible.The analyst uses a computer program to draw 54 customers at random and selects these customers. Every set of 54 customers is equally likelyto be drawn by the computer program.(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 stratifiedsample of seats?The supervisor uses a computer program to draw 60 seats at random and selects these seats. Every set of 60 seats is equally likely to be drawnby the computer program.The supervisor forms 5 groups of seats based on the dates the seats were last replaced. Then, she selects 12 seats at random from each group.The supervisor forms groups of 12 seats based on the sections the seats are in. Then, she selects all of the seats in 5 randomly chosen groups.(c) A botanist at a nursery wants to inspect the health of the plants at the nursery. Which of the following best describes a convenience sample ofplants?All of the plants that are in one particular room at the nursery are easily accessible. So, the botanist selects the 72 plants in this particular room.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 takes a list of the plants and selects every 3" plant until 72 plants are selected.WSEP20910...F11F10F9FB888F7吕0F6F5F4F3F2$%8

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(a) A bank analyst wants to ask customers who have a mortgage with the bank about the customers' home-buying experiences. Which of the following best describes a random sample of customers? The analyst forms groups of 9 customers based on the cities the customers live in. Then, she selects all of the customers in 6 randomly chosen groups. The analyst spends a day calling mortgage customers and selects the first 54 customers who answer because these customers are easily accessible. The analyst uses a computer program to draw 54 customers at random and selects these customers. Every set of 54 customers is equally likely to be drawn by the computer program.