The gasoline consumption of Chevy vans is known to be approximately normally distributed. If a random sample of 25 vans has a mean of 31.7 mpg for highway driving with s = 2.9 mpg. Construct a 95% confidence interval for the population parameter by answering the following questions. (a) Do you use a z or t score in the formula calculation? Why? (b) What is that score? (Look it up on the table. Give the positive value.) (c) Using the formula find the the confidence interval to TWO decimal places: to

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