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You would also like to understand the variance of how much money your friends spent on eclipse-related items & travel (glasses, cameras, gas, etc.), so

You would also like to understand the variance of how much money your friends spent on eclipse-related items & travel (glasses, cameras, gas, etc.), so you would now like to create a 90% two-sided confidence interval for the population variance. This time, you talked to 30 friends, and found out they spent an average of $145, with a sample standard deviation of $12. What would be the lower (smaller) chi-square distribution value to use in this calculation (to 3 decimal places)

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