Which of the following would be a good means of random assignment?Multiple choice question.Every participant who smiles at the experimenter are in Condition 1, those who do not are in Condition 2.All participants who show up before noon are assigned to Condition 1; those who show up after noon are assigned to Condition 2.Flip a coin for each participant; heads for Condition 1, tails for Condition 2.All men are Condition 1; all women are Condition 2.

Random assignment is a procedure for assigning participants in an experiment to either the treatment or control groupMultiple choice question.based on the preference of the participant.based on what group the previous participant was assigned to.on the basis of chance, like the flip of a coin.based on a specific pattern picked by the experimenter in advance.

You flip a coin. If heads comes up the next person is in the treatment group. If it comes up tails, the next person is assigned to the control group. You areMultiple choice question.using random assignment in an experiment.using arbitrary assignment in an experiment.using random assignment in a correlational study.using arbitrary assignment in a correlational study.

At a local elementary school, a principal is making random class assignments for her 8 teachers. Each teacher must be assigned to exactly one job. In how many ways can the assignment be made?

(a)A manager at a bus company wants to survey employees about the new uniforms. Which of the following best describes a random sample of employees?The manager asks for volunteers and selects every volunteer until 60 employees are selected. She selects the volunteers because these employees are easily accessible.The manager forms groups of 12 employees based on the departments the employees are in. Then, she selects all of the employees in 5 randomly chosen groups.The manager uses a computer program to draw 60 employees at random and selects these employees. Every set of 60 employees is equally likely to be drawn by the computer program.(b)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 8 workers based on the lengths of time the workers have worked at the factory. Then, he randomly chooses 9 groups and selects all of the workers in these groups.The consultant assigns each worker a different number. Using a random number table, he draws 72 of those numbers at random. Then, the consultant selects the workers assigned to the drawn numbers. Every set of 72 workers is equally likely to be drawn using the random number table.The consultant forms 6 groups of workers based on the workers' shifts. Then, he selects 12 workers at random from each group.(c)A city manager wants to poll residents about a park renovation. Which of the following best describes a convenience sample of residents?The city manager takes a list of the residents and selects every 5th resident until 90 residents are selected.The first 90 residents who walk into city hall one day are easily accessible. So, the city manager selects these residents.The city manager forms 5 groups of residents based on the residents' incomes. Then, she selects 18 residents at random from each group.

A group consists of equal number of men and women. Of this group 20% of the men and50% of the women are unemployed. If a person is selected at random from this group, find theprobability of the selected person being employed.