Course Hero Logo
Upload to Study
Expert Help

Section 9.3 Quiz.pdf - AP Statistics Quiz 9.3 Name: The...

Doc Preview
Pages 2
Identified Q&As 2
Solutions available
Total views 100+
AP Statistics Quiz 9.3Name: The Environmental Protection Agency has determined that safe drinking water should have an average pH of 7 moles per liter.You are testing water from a new source, and take 30 vials of water.Water is unsafe if it deviates too far from 7 moles per liter in either direction. The mean pH level in your sample is 6.4 moles per liter, which is slightly acidic. The standard deviation of the sample is 0.5 moles per liter. (a)Do the data provide convincing evidence at theα= 0.05 level that the true mean pH of water from this
Course Hero Badge

End of preview

Want to read all 2 pages? Upload your study docs or become a member.
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.