Question: Construct a confidence interval for assuming that each sample is from a normal population. (a) x=30,=5,n=15,90 percentage confidence. (Round your answers to 2 decimal places.)

Construct a confidence interval for assuming that each sample is from a normal population. (a) x=30,=5,n=15,90 percentage confidence. (Round your answers to 2 decimal places.) (b) x=121,=7,n=25,99 percentage confidence. (Round your answers to 2 decimal places.) (c) x=128,=19,n=45.95 percentage confidence. (Round your answers to 3 decimal places.)

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