Question: YES OR NO ,Based on the plot produced, do you think the constant variance assumption is reasonable? o 00 0 0 o 1970 o o

o 00 0 0 o 1970 o o 1980 o 1990 Year

YES OR NO ,Based on the plot produced, do you think the constant variance assumption is reasonable?

o o o 2010 o o 1960 00 0 2000 2020

o 00 0 0 o 1970 o o 1980 o 1990 Year o o o 2010 o o 1960 00 0 2000 2020

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