Question: Eighty-one compact car engines of the same type get randomly selected using an SRS and independently tested by the EPA for nitrogen oxide emissions. The

Eighty-one compact car engines of the same type get randomly selected using an SRS and independently tested by the EPA for nitrogen oxide emissions. The test results show an average of 1.3 grams per mile with a standard deviation of 0.64 grams per mile. Find a 95% confidence interval for the average grams of nitrogen oxide emitted per mile for this type of engine.

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