Refer to the National Snow and Ice Data Center (NSIDC) collection of data on the albedo of ice melt ponds, Exercise 7.80. The visible albedo values for a sample of 504 ice melt ponds located in the Canadian Arctic are saved in the PONDICE file. 

a. Conduct a test (at α = .10) to determine if the true variance of the visible albedo values of all Canadian Arctic ice ponds differs from .0225. (Note: For 503 df, x²_.95 = 451.991 and x²_.05 = 556.283.)

b. Discuss the practical significance of the test in part a.

Data from Exercise 7.80

Refer to the National Snow and Ice Data Center (NSIDC) collection of data on the albedo of ice melt ponds, Exercise 7.36. The visible albedo values for a sample of 504 ice melt ponds located in the  Canadian Arctic are saved in the PONDICE file. Find a 90% confidence interval for the true variance of the visible albedo values of all Canadian Arctic ice ponds. Give both a practical and theoretical interpretation of the interval.

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