1.Give a real-life example where a one-sample test about the population mean when ? is unknown might be used.
2.Give a real-life example where a test of the mean difference might be used.
3.Give a real-life example where a test of the difference between two means might be used.
4.Give a real-life example of where attest of the difference between two variances might be used.
5.Give a real-life example of where a one-way analysis of variance might be used.

I've got no clue where you'd use these.

Thanks.