This is the result from a lab,but I am not sure the results are correct. I guess the combination of R1=10k and R2=10k is under linear region,but how come the calculated Ib is zero. For combination of R1=10k and R2=1k,Idon't know why the Ie is negative.Negative value means error?Is it the cut off mode? And for combination of R1=1k and R2=10k,it should be in saturation? I guess either the measured or calculated result is wrong.What is the problem? Also,there are many differences(highlighted).Is my calculation wrong?