Welch_output_allcities.csv

	Welch Two Sample t-test

data:  all_beforelockdown2020$pm25 and all_afterlockdown2020$pm25
t = 21.924, df = 4105, p-value < 2.2e-16
alternative hypothesis: true difference in means is not equal to 0
95 percent confidence interval:
 27.76034 33.21277
sample estimates:
mean of x mean of y 
 137.0970  106.6104 


	Welch Two Sample t-test

data:  all_beforelockdown2019$pm25 and all_afterlockdown2019$pm25
t = 10.079, df = 4595.6, p-value < 2.2e-16
alternative hypothesis: true difference in means is not equal to 0
95 percent confidence interval:
 11.08069 16.43237
sample estimates:
mean of x mean of y 
 137.8767  124.1202 


	Welch Two Sample t-test

data:  all_beforelockdown2019$pm25 and all_beforelockdown2020$pm25
t = 0.50566, df = 4565.1, p-value = 0.6131
alternative hypothesis: true difference in means is not equal to 0
95 percent confidence interval:
 -2.243419  3.802940
sample estimates:
mean of x mean of y 
 137.8767  137.0970 


	Welch Two Sample t-test

data:  all_afterlockdown2019$pm25 and all_afterlockdown2020$pm25
t = 14.701, df = 4709.4, p-value < 2.2e-16
alternative hypothesis: true difference in means is not equal to 0
95 percent confidence interval:
 15.17478 19.84478
sample estimates:
mean of x mean of y 
 124.1202  106.6104