The Mean Systolic Blood Pressure for a Random Sample of 28

Multiple Choice

The mean systolic blood pressure for a random sample of 28 women aged 18 -24 is 112.4 mm Hg and the standard deviation is 12.8 mm Hg. Construct a 90% confidence interval for the standard deviation σ, of the systolic blood pressures of all women aged 18-24. Round to the nearest hundredth when necessary.

A) (10.5, 16.55)
B) (10.34, 16.17)
C) (10.97, 15.63)
D) (9.98, 17.92)