References Mailings Review View Help :?|a-hall! TT Normal TNo Spac., 1 Heading i

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References Mailings Review View Help :?|a-hall! TT Normal TNo Spac., 1 Heading i|Heading 2 Title S Paragraph Styles 29 28 27 26 195?1960 1970 1980 1990 2000 2010 9. The peaks in the SST data are El Niño (warm) eveats while the lows in SSTs are La Niña (cool) events.-these cyclic temperature changes are referred to as ENS?(B Niño-Southern Oscillation) events. Divide the total amount of time by the number of events to get the average time imterval bebween El Niño events Show all your calculations 10. Now count the actual number of yeara between each El Niño event. What is the maximum and minimum range of time between these events? 11. Which technique, average time intervaf bettween El Nito erveats or actual range of time between El Niño eveats, do you think it is better to use when deacribing the Heguency of events if you were a government policy maker How about if you are the owner of a New Mexico eki resort? Explain your answer

Explanation / Answer

9. While calculating average rate of ENSO event from the given graph, we should consider only the number of major peaks and divide by it the total number of years. In one ENSO there is one El-Nino and one La-Nina event. Total number of ENSO events from 1950-2010(60years) is 16. So, average rate of ENSO is 60/16=3.75 years.

10. The maximum range of time between El-Nino events is between 1950-60, 1980-90 and 1995-2005, where at maximum only two El-Nino events occurred in a period of 10 years. So, it occurred at a rate of per 5years. The minimum range of the events is seen from 1965-85 when 8 El-Nino events occurred in only 20 years with a rate of per 2.5 years.

11. The actual range should be given as average rate+/- maximum deviation. Here it can be given as 3.75 +/- 1.25 years, because maximum deviation is 1.25 ( both in case of per 2.5 years and 5.0 years).

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