A Student Wanted to Quickly Construct a 95% Confidence Interval

Multiple Choice

A student wanted to quickly construct a 95% confidence interval for the average age of students in
Her statistics class. She randomly selected 9 students. Their average age was 19.1 years with a
Standard deviation of 1.5 years. What is the 95% confidence interval for the population mean?

A) [0.97, 3.27]
B) [15.64, 22.56]
C) [17.97, 20.23]
D) [17.95, 20.25]
E) [17.42, 20.78]