PS1.1NF - April May June July Aug Sept Oct Nov Dec 1 196.55...

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Nina Fitch SID# 17849531 IB 106A 2/1/08 Problem Set 1 1) a. b. Yes, there is a trend. This is because even though there are seasonal fluctuations in the data (Increased primary production in the winter and summer months and decreased rates in the spring and fall), however over the six years there is a gradual increase in primary production. The trend is the equation of the line (y=.3617x+169.91)
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The data was detrended using excel, the trend of the data (y=.3617x-169.91) was subtracted from the primary production values in the first graph where x=the month (January 1967=1 to December 1981=72). The detrended data shows the monthly fluctuation of primary production c. Jan Feb March
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Unformatted text preview: April May June July Aug Sept Oct Nov Dec 1 196.55 165.525 169.75 157.6 169.95 181.82 199.025 198.15 177.15 168.7 170.65 185.15 in 178.2 156.7 164.2 153.2 157.5 172.6 185.9 185.8 165 163.6 166.3 183.1 edian 198.65 176.65 178.1 164.15 175.45 187.05 202.5 205.25 183.1 177.05 175.95 190.3 ax 209.5 188.7 187.5 172.4 178.2 202.7 220.2 215.4 191.5 181.4 178.6 195.6 3 203.9 184.625 184.8 169.275 177.2 188.9 212.725 209.05 186.575 179.475 177.125 194.625 To assess seasonal variability the data for each month was arranged into quartiles 25%, median, and 75% as well as the maximum and minimum values for each month using excel. The information was plotted into a box plot shown above....
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PS1.1NF - April May June July Aug Sept Oct Nov Dec 1 196.55...

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