Question

Question 1

Tests comparing 2 population means can be:

1. surveys
2. experiments
3. both surveys and experiments

Question 2

If all the experimental units are identical (ex: clones), you will set up the study as:

1. CRD
2. Block Design

Question 3

a 2 sample t-test still has which normality assumption(s)?

1. The population is normal or n is greater than 30
2. both populations are normal or both sample sizes are greater than 30

Question 4

When you block by some variable in a block study, you will be able to quantify the effect of the variable at the end of the study. For example, if I block by sex in a study of mice, at the end of the study I will be able to quantify how male mice respond and how female mice respond

1. True
2. False

Question 5

For a paired t-test the assumption of normality is about the distribution of the differences, not the distribution of the original data.

1. True
2. False

Question 6

I want to know if an energy drink increases heart rate. I measure the heart rate of person before and after the energy drink. The difference is calculated as After HR minus Before HR. The rejection region of statistical test is:

1. left tail
2. right tail
3. both tails

Question 7

You have a lake that is half shaded and half sunny. If you want to run an experiment and don't want to quantify the effects of sunlight but don't want it to effect you results, you would set up your study as a :

1. CRD
2. Block Design

Question 8

For a CRD, the experimental units are considered:

1. independent
2. dependent

Question 9

Blocking where there is no known reason to will decrease the statistical power of you study

1. True
2. False

Question 10

Blocking because it allows you to get rid of some nuisance variability will increase your statistical power

1. True
2. False

Answer 1