Review set
Design-based intervals
The questions ask you to judge an interval someone else computed and to say what it does and does not cover, rather than to repeat the calculation. Recomputing a standard error is the part that comes back easily; knowing what the number leaves out is the part worth checking.
What this involves
Retrieval after a delay, which is what makes knowledge durable.
Answers here count towards what the system knows about your skills.
What this covers
- Estimate an average effect and its design-based uncertainty
Given summary data from a completely randomized experiment, the learner can compute the difference in means, compute its conservative variance and standard error, form a confidence interval, and explain which term of the exact variance has been omitted and why that makes the result conservative rather than incorrect.