Question

A hydrologist wants to compare the river discharge in 1990 and 2019. He randomly selected 12 monitoring stations, and collected the river discharge at the station (see the following table for the data). Data source: US Geological Survey, unit: ft³/s.

Station ID	Discharge in October 1st 1990, 12AM	Discharge in August 31, 2019, 12AM
01010000	2050	379
01010070	131	42
01010500	19900	867
01011000	1770	1040
01017000	1590	504
01013500	693	206
01593370	0.19	0.28
01047200	87.4	6.14
01022840	1.50	0.31
01042500	2650	591
01031510	80.2	40.4
01054200	107	24.9

Choose the most appropriate method and do a hypothesis testing by hand to compare the river discharge in 1990 and 2019. You need to create the hypotheses by yourself. Include the steps of hypothesis testing.

Answer 1