1. Letecia the goatherd is planning a move to Southern California from her nativ

Question

1. Letecia the goatherd is planning a move to Southern California from her native Missouri due to the NAACP’s travel advisory for Missouri. She has heard about the difficulties commuting in Southern California and wants to see how bad it really is. In Cedar Grove where she and her goats currently live, the mean commute time is 17.8 minutes. She asks a random sample of 200 residents of Los Angeles county how long it takes them to get to work.

a. Describe the population being studied.

b. Describe the variable being measured in this study.

c. What type of variable is the variable you described in part b?

d. Would this be an example of an observational study or a controlled experiment?

Explanation / Answer

a. The population is all the residents of Los Angeles county.

b. The variable being measured is the commute time.

c. Since the commute time has a numerical value and a unit, this is an ordinal variable.

d. Since Letecia cannot control the commute time of Los Angeles county's residents, this is an example of observational study.

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