Question 1205340: Acid rain from the burning of fossil fuels has caused many of the lakes around the world to become acidic. The biology in these lakes often collapses because of the rapid and unfavorable changes in water chemistry. A lake is classified as nonacidic if it has a pH greater than 6. A. Marchetto and A. Lami measured the pH of high mountain lakes in the Southern Alps and reported their findings in the paper “Reconstruction of pH by Chrysophycean Scales in Some Lakes of the Southern Alps” (Hydrobiologia, Vol. 274, pp. 83-90). The pH levels obtained by the researchers for 15 lakes are 7.2, 7.3, 6.1, 6.9 6.6, 7.3, 6.3, 5.5, 6.3, 5.7, 6.9, 6.7, 7.9, and 5.8. At the 5% significance level, do the data provide sufficient evidence to conclude that, on average, high mountain lakes in the Southern Alps are nonacidic? A. State null hypothesis
B. State alternative hypothesis
C. Level of significance
D. Test statistic E. Decision rule based on p-value
F. Statistical decision
G. Conclusion
Answer by Theo(13342)   (Show Source):
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