A comparison between the average jail time of bank robbers and car thieves yielded the following results (in years):
n1=80 x1 bar = 3.2, s1=0.6
n2=90 x2 bar = 2.8 s2=0.7
Estimate the lower bound confidence limit for mu1-mu2?
A.) 0.21
B.) 0.92
C.) 0.08
D.) 0.3