Confidence Interval and Hypothesis Test
Conclusions
Confidence Interval
We are (1- certain that the mean (proportion)* of __________ is between
_____________ and _______________.
Reject the Null Hypothesis always refer to H1
We conclude that the mean (proportion) of _________ is “not equal to”(“greater than” ,
“less than”) ___________. We say that there is a ____________%** chance that we are
wrong.
Fail To Reject the Null Hypothesis. always refer to H1
We have failed to show that the mean (proportion) of _______is “not equal to”(“greater
than” , “less than”) ___________.
Errors
Type I: We reject H0 when H0 is actually true.
Type II: We fail to reject H0 and H0 is not true.
________________________________________________________________________
If you use the word “mean” or “proportion” you must somehow convey which
mean/proportion you are talking about, the mean /proportion of the population or the
mean /proportion of the sample.
*
Put  in the blank. If no  is given then you put the p-value in the blank.
**