(a) A consultant wants to ask workers at a factory about the workers' job satisfaction. Which of the following best describes a stratified sample of workers?The consultant forms groups of 30 workers based on the lengths of time the workers have worked at the factory. Then, he randomly chooses 3 groups and selects all of the workers in these groups.The consultant forms 5 groups of workers based on the workers' shifts. Then, he selects 18 workers at random from each group.The consultant assigns each worker a different number. Using a random number table, he draws 90 of those numbers at random. Then, the consultant selects the workers assigned to the drawn numbers. Every set of 90 workers is equally likely to be drawn using the random number table.(b) A manager at a bus company wants to survey employees about the new uniforms. Which of the following best describes a systematic sample of employees?The manager takes a list of the employees and selects every 3rd employee until 78 employees are selected,The manager asks for volunteers and selects every volunteer until 78 employees are selected. She selects the volunteers because these employees are easily accessible.The manager forms 6 groups of employees based on the departments the employees are in. Then, she selects 13 employees at random from each group.(c) 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 random sample of passengers?The host forms groups of 8 passengers based on the passengers' ages. Then, he randomly chooses 7 groups and selects all of the passengers in these groups.The host assigns each passenger a different number. Using a random number table, he draws 56 of those numbers at random. Then, he selects the passengers assigned to the drawn numbers. Every set of 56 passengers is equally likely to be drawn using the random number table.The host takes a list of the passengers and selects every 7th passenger until 56 passengers are selected.