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Unformatted text preview:source differs from 7 moles per liter? Starnes/Tabor, The Practice of Statistics, 6/e © 2018 BFW Publishers, Inc. (b) A 95% confidence interval for the true mean pH level of the water is( ) 6.21, 6.59 . Interpret this interval. (c) Explain why the interval in part (b) is consistent with the result of the test in part (a). (d) The power of the test to detect µ = 6.8 is 0.59. Interpret this value. (e) Give one way to increase the power of this test. Starnes/Tabor, The Practice of Statistics, 6/e © 2018 BFW Publishers, Inc.