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A manufacturer of soda fountain machines claims its machine dispense liquidwith a standard deviation of 3.1...

A manufacturer of soda fountain machines claims its machine dispense liquidwith a standard deviation of 3.1 ounces. A random sample of 20 machines found the standard deviationto be 4.6 ounces. Is there enough evidence, at theα= 0.05level of significance, to suggest the standarddeviation is not 3.1 ounces?

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