Assignment for ‘Sampling, DOE and
Measuring’
- Present examples for each of the six types of
errors which threaten the representativity of a sample. Preferably ‘real’,
e.g. from a newspaper (cf. ‘Verknipte Statistiek’).
- Describe a situation where it would be a good idea
to use
·
stratified sampling
·
cluster sampling
- Present three examples of experiments that suffer
from confounding.
- Give a (rather precise) description of setting up
an experiment to check the claim that praying increases the harvest.
(Example derived from an experiment with soy beans in Jamestown, Ohio.)
- Present an example where
- the realistic content is questionable
- a CRD is not advisable and a RCBD is to be
preferred
- Give an example of a measure which is
·
valid but unreliable
·
reliable but invalid
- Give an example of an experiment where sample mean
and variance are not very sensible choices.