Question

A manager at a bus company wants to survey employees about the new uniforms. Which of the following best describes a stratified sample of employees?

a. The manager uses a computer program to draw 78 employees at random and selects these employees. Every set of 78 employees is equally likely to be drawn by the computer program.
b. 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. The manager asks for volunteers and selects every volunteer until 78 employees are selected. She selects the volunteers because these employees are easily accessible.

Answer 1

At the beginning of the 20th century, they were built to compete against roads by offering greater road flexibility, and the further calculation can be defined as follows:

• The software program in each collection of 78 workers would be likely to be drawn from the software.  
• This kind of huge autonomous, wheeled car, usually on a fixed route, is used to transport passengers. 
• The bus company management wants to look into the new uniforms for staff. The manager draws 78 people at random with such a computer program and selects those.
• The stratified sampling of employees can ideally be drawn from the set of 78 employees through the computer program.

Following are the description of the wrong choice.

• In option b, it is wrong because creating a group of employees is not good because after that we select the employee randomly.
• In option c it is wrong because in this question we select employees only.

Therefore, "Option a" is correct.

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