ARG Argentina 1,781 1,695

BRA Brazil 1,785 1,739

CHL Chile 2,095 1,988

COL Colombia 2,081 1,992

CRI Costa Rica 2,398 2,212

ECU Ecuador 1,846 1,734

MEX Mexico 2,258 2,256

PER Peru 1,990 1,904

URY Uruguay 1,624 1,563

a) Using the data provided, estimate the difference in number of hours worked between the two target years. Use the 95% confidence level. b) Can you use the estimate you created in (a) to determine if there has been a reduction in the number of hours worked? Why