5) Acid rain from the burning of fossil fuels is worldwide concern. Researchers believe that acid rain has caused many lakes from around the world to become acidic. A lake is classified as non-acidic if it has a pH level greater than 6. A recent study of 15 mountain lakes in Southern France revealed an average pH level of 6.6 with a standard deviation of 0.672. Does a test at the 5 % level of significance provide researchers with enough evidence to conclude that the lakes in Southern France are non-acidic?

Question

5) Acid rain from the burning of fossil fuels is worldwide concern. Researchers believe that acid rain has caused many lakes from around the world to become acidic. A lake is classified as non-acidic if it has a pH level greater than 6. A recent study of 15 mountain lakes in Southern France revealed an average pH level of 6.6 with a standard deviation of 0.672. Does a test at the 5 % level of significance provide researchers with enough evidence to conclude that the lakes in Southern France are non-acidic?

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