bad mood

while doing the hypothesis 2 tutorial, i suddenly realised that my hypothesis testing question in block test was wrong right from the hypothesis itself... wah... 12 points gone liao...

and spent a lot of time doing the hypothesis tut.... couldn't tell whether it's independent or dependent, z test or t text... and some questions a re weird... dunno why, esp the prelim qns... better still no answeres given... so blur