35. Sodium Chloride Measurements of water intake, obtained from a sample of 17 rats that had been...

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35. Sodium Chloride Measurements of water intake, obtained from a sample of 17 rats that had been injected with a sodium chloride solution, produced a mean and standard deviation of 31.0 and 6.2 cubic centimeters

(cm3 ), respectively. Suppose that the average water intake for noninjected rats observed over a comparable period of time is 22.0 cm3.

a. Do the data indicate that injected rats drink more water than noninjected rats? Test at the 5% level of significance.

b. Find a 90% confidence interval for the mean water intake for injected rats.

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