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Use the One-Standard-Deviation Chi-Square Interval Procedure to Obtain the Specified σ\sigma

Question 70

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Use the one-standard-deviation chi-square interval procedure to obtain the specified confidence interval for thepopulation standard deviation σ\sigma . . Assume that the population has a normal distribution.
-The daily intakes of milk (in ounces) for ten five-year old children selected at random from one school were: 29.127.813.019.422.719.125.514.219.220.3\begin{array} { l l l l l } 29.1 & 27.8 & 13.0 & 19.4 & 22.7 \\ 19.1 & 25.5 & 14.2 & 19.2 & 20.3 \end{array}

Find a 99%99 \% confidence interval for the standard deviation, σ\sigma , of the daily milk intakes of all five-year olds at this school.


A) 0.820.82 to 3.26oz3.26 \mathrm { oz }
B) 3.293.29 to 12.13oz12.13 \mathrm { oz }
C) 3.293.29 to 10.89oz10.89 \mathrm { oz }
D) 3.183.18 to 10.89oz10.89 \mathrm { oz }

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