The grade point averages for 10 randomly selected students are listed below. Construct a 90% confidence interval for the population standard deviation. Assume the data are normally distributed. 2.0 3.2 1.8 2.9 0.9 4.0 3.3 2.9 3.6 0.8
A (0.81, 1.83)
B (1.10, 2.01)
C (0.53, 1.01)
D (0.32, 0.85)

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