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A medical researcher surveyed 12 hospitals and found that the standard deviation for the cost for...

A medical researcher surveyed 12 hospitals and found that the standard deviation for the cost for removing a person's gall bladder was $45. Assume that variable is nrmally distributed. What would be the 90% confidence interval of the population variance?

Question options:

1001.2<σ2<2139.1

1354.3<σ2<3689.2

1132.2<σ2<4868.9

1234.2<σ2<2345.7

None of these
Math   Statistics-And-Probability   
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Answer #1

For critical value of Chi square, used chi sqare Statistical table

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