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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