In the context of hypothesis testing and the scope of this course, the confidence interval method can be used in these situation(s) (mark all that apply):

1 tailed test about variances.

1 tailed test about proportions.

2 tailed test about means with sigma unknown.

2 tailed test about variances.

2 tailed test about means with sigma known.

1 tailed test about means with sigma known.

2 tailed test about proportions.