[GWA 030] Hypothesis Testing - Neelam91/Global-Warming-Analysis GitHub Wiki

I wanted to run a statistical test to check my research hypothesis about global warming.

Null Hypothesis: Global Warming is not happening Alternate hypothesis: Global Warming is happening

The manifestation of global warming was evaluated by three parameters that were global temperature data, Arctic ice melting data and Sea level rise data. Each of these parameters was assessed using two sample t-test.

For performing the t-test, total of 57 observations from year 1970 to 2016 were divided into two groups. Group1 had observations from year 1970 to 2000 and group2 had observations from year 2001 to 2016.

Results: The difference between both of these groups were found to be statistically significant at a confidence level of 95% and significance level of 0.05. Based on the t-test analysis I was able to reject the null hypothesis.

Graphs:

Based on the Ice melting graph of Arctic ice, the average rate of ice melting has increased as the ice sheet covered area in million square KM is decreasing over the years.The ice melting rate in year 1979 to 2000 was increased by 0.5 million square KM that means ice extent has decreased from 7 million square KM to 6.5 million square KM. In year 2001 to 2016, the rate of ice melting has increased by 2 million square KM which is 4 time of previous 2 decades.

As per the global average temperature graph world's average temperature is rising with increasing speed. The temperature rise rate has increased by 0.5 degree celsius in recent 16 years which is higher than average temperature rising rate of 0.1 degree Celsius from 1979 to 2000. Therefore, world’s temperature rise rate has increased by 5x since 2001 to 2016 in comparison to year 2000s.

Based on the Sea Level Rise graph the average rate of rise is increasing since 1979. The rate of seal level rise has increased from 7 inches in 2000 to 9.5 inches in 2016. As per the graph the average rate of sea level rise is constantly increasing.