A national survey showed that a certain brand of cold cuts was priced, on average, at $1.15 per 100 g. Suppose a national survey of 23 retail outlets was taken and the price per 100 g of these cold cuts was ascertained. If the following data represent these prices, what is a 90% confidence interval for the population variance of these prices? Assume prices are normally distributed in the population.

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$1.14 $1.15 1.14 1.13 1.11 1.14 1.15 1.12 1.15 1.14 $1.16 1.16 1.16 1.15 1.14 $1.14 1.15 1.15 1.15 $1.17 1.13 1.14 1.17