In: Math
1) Volatility (variation) of investment rates is an important consideration for investors. The following data represent the rate of return (%) for some mutual funds for the past 12 years, (like Sullivan, 5e, p 454, #16c). Determine the 95% confidence interval for the population standard deviation. 2 1 / 2 2 2 / 2 2 ( 1) / ( 1) / n s n s (d.f. = n-1) 12.8 15.9 10.0 12.4 14.3 6.6 9.6 12.4 10.3 8.7 14.9 6.7
A) 2.2 < σ < 5.2
B) 2.3 < σ < 4.9
C) 3.2 < σ < 5. 6
D) 2.0 < σ < 5.9