Researchers surveyed the yearly water usage per household (in kgal) for two locations in Sonoma County, California, from 2005 to 2010. Some of the summary statistics are shown. Using the summary statistics from the study. calculate the standard error. SE. of the difference in the mean water usage between the two locations. Assume that the population variances arc not equal. Give your answer precise to two decimal places. SE = ..................... kgal

Population 1 2 Population description location 1 location 2 Sample size n = 225 n = 236 Sample mean X = 125.0 X = 108.0 Sample standard deviation $ = 7.12 $2 = 8.55 Sample standard error SE = 0.47 SE = 0.56