Problem

Characteristics of ice-melt ponds. Refer to the University of Colorado study of ice-melt p...

Characteristics of ice-melt ponds. Refer to the University of Colorado study of ice-melt ponds in the Canadian Arctic, presented in Exercise. Environmental engineers are using data collected by the National Snow and Ice Data Center to learn how climate affects the sea ice. Data on 504 ice melt ponds are saved in the PONDICE file. Of these 504 melt ponds, 88 were classified as having “first-year ice.” Recall that the researchers estimated that about 17% of melt ponds in the Canadian Arctic have firstyear ice. Use the methodology of this chapter to estimate, with 90% confidence, the percentage of all ice-melt ponds in the Canadian Arctic that have first-year ice. Give a practical interpretation of the results.

Characteristics of ice melt ponds. The National Snow and Ice Data Center (NSIDC) collects data on the albedo, depth, and physical characteristics of ice melt ponds in

The FREQ Procedure

ICETYPE

Frequency

Percent

Cumulative Frequency

Cumulative Percent

First-year

88

17.46

88

17.46

Landfast

196

38.89

284

56.35

Multi-year

220

43.75

504

100.00

the Canadian Arctic. Environmental engineers at the University of Colorado are using these data to study how climate affects the sea ice. Data on 504 ice melt ponds located in the Barrow Strait in the Canadian Arctic are saved in the PONDICE file. One variable of interest is the type of ice observed for each pond, classified as firstyear ice, multiyear ice, or landfast ice. An SAS summary table and a horizontal bar graph that describe the types of ice of the 504 melt ponds are shown at the bottom of page.

a. Of the 504 melt ponds, what proportion had landfast ice?


b. The University of Colorado researchers estimated that about 17% of melt ponds in the Canadian Arctic have first-year ice. Do you agree?


c. Convert the horizontal bar graph into a Pareto diagram. Interpret the graph.

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