Classifying samples John (a) A manager at a bus company wants to survey employees about the new uniforms. Which of the following best describes a cluster sample of employees? The manager takes a list of the employees and selects every 4" employee until 80 employees are selected. The manager forms groups of 20 employees based on the departments the employees are in. Then, she selects all of the employees in 4 randomly chosen groups. O The manager asks for volunteers and selects every volunteer until 80 employees are selected. She selects the volunteers because these employees are easily accessible. (b) A host on a cruise ship wants to collect data on the time passengers spend at various activities on board. Which of the following best describes a stratified sample of passengers? O The host forms groups of 12 passengers based on the passengers' ages. Then, he randomly chooses 5 groups and selects all of the passengers in these groups. O The host forms 5 groups of passengers based on the levels of the ship that the passengers' cabins are on. Then, he selects 12 passengers at random from each group. O The host selects the first 60 passengers who board because these passengers are easily accessible. (c) A consultant wants to ask workers at a factory about the workers' job satisfaction. Which of the following best describes a systematic sample of workers ? The consultant forms 2 groups of workers based on the workers' shifts. Then, he selects 25 workers at random from each group. O a The consultant assigns each worker a different number. Using a random number table, he draws 50 of those numbers at random. Then, the consultant selects the workers assigned to the drawn numbers. Every set of 50 workers is equally likely to be drawn using the random number table. The consultant takes a list of the workers and selects every 5" worker until 50 workers are selected. O