At a Particular Academically Challenging High School, the Average GPA

question 27

Multiple Choice

At a particular academically challenging high school, the average GPA of a high school senior is known to be normally distributed. After a sample of 20 seniors is taken, the average GPA is found to be 2.71 and the variance is determined to be 0.25. Find a 90% confidence interval for the population mean GPA.

• A) [2.5167, 2.9033]
• B) [2.5261, 2.8961]
• C) [2.5615, 2.8585]
• D) [2.6358, 2.7842]

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