Quiz 10.2 and 10.3
Day 110
Students Struggled With…

Using the correct t* critical value when calculating a t interval.

Deciding between μ1 μ2 and μdiff.
Remedies…

Require students write the specific formula for a t interval. This extra step may remind them that they need a t* instead of a z* which was the most common value they used instead.

To help decide between these procedures, students should ask themselves a

How many samples do I have?

0ne. μdiff

Two. μ1 μ2 (usually) Watch out for two samples that pair individuals.


Can any piece of data in the first group be compared to any piece of data in the second?

Yes. μ1 μ2

No, they must stay in pairs. μdiff


Do they reference pairing the data?

Yes. μdiff

No. μ1 μ2

