Use the Given Information to Find the Minimum Sample Size $\mu$

question 18

Multiple Choice

Use the given information to find the minimum sample size required to estimate an unknown population mean $\mu$
-How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters? We want 90% confidence that the sample mean is within 4 minutes of the population mean, and the population
Standard deviation is known to be 12 minutes.

• A) 60
• B) 25
• C) 35
• D) 49

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Definitions:

Treatment Order

involves the sequence in which experimental treatments are administered to participants, particularly relevant in studies with multiple interventions.

Statistical Power

Describes the likelihood that a test will correctly reject a false null hypothesis, essentially the capacity of a study to detect an effect if there is one.

Counterbalanced Crossover Design

An experimental design where participants are exposed to multiple conditions in a specific order to control for the effects of the order on the outcome.

Between-Subjects Design

An experimental design in which different subjects are assigned to each group or condition being compared, to ensure that each participant experiences only one variation of the experimental manipulation.