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A random sample of 30 lunch orders at Noodles & Company showed a standard deviation of $5.31. Find the 90 percent confidence interval for the

A random sample of 30 lunch orders at Noodles & Company showed a standard deviation of $5.31. Find the 90 percent confidence interval for the population standard deviation. Use Excel to obtain

=CHISQ.INV(/2,d.f.)

L2=CHISQ.INV(/2,d.f.)and

=CHISQ.INV.RT(/2,d.f.)

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