Analyzing 116 Years of Ice-out Data Lake Minnetonka, Minnesota (Back to Journey North Ice-out Contest) Scattergram Lake Minnetonka Ice-Out Dates 1887-2002 The "scattergram" on the right includes 116 ice-out dates for Lake Minnetonka from 1887 to 2002. Print the scattergram. At first glance, do you see any pattern? Draw a line on the scattergram to show the average ice-out date for Lake Minnetonka. (To find the average, use the ice-out records on this table.) On the scattergram, find the five years when ice-out occurred the EARLIEST. Next, find the five years when ice-out occurred the LATEST. Do you see any patterns? How else might you display the data? People concerned about global warming use ice-out dates as one measure of climate change. Do you see a warming trend, based on data from this lake?

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