Unit 1 Statistics and Experiments

Question 1

What are the experiment types?

Answer 1

1. Experiments
2. Correlational research designs
3. Quasi-experimental designs
4. Case studies
5. Observational research designs
6. Self-report
7. Interviews

Question 2

What are the types of sampling?

Answer 2

Stratified, random, convenience.

Question 3

What are the research designs?

Answer 3

Repeated measures, Matched pairs, Independent groups.

Question 4

What are all the types of hypothesis?

Answer 4

1. Null
2. Alternative : directional or non-directional.

(directional= effect is specified e.g. increase)

Question 5

When do you use a t-test vs Man Whitney U and what are they used for?

Answer 5

• T-test is a sample size over 30
• tests whether it is statistically significant
• for t test, when p>a statistically significant
• for Man Whitney U, Ucrit is like alpha value and Ustat is like the p value

Question 6

What does the r value do?

Answer 6

R value shows whether there is a relationship and how strong it is.

1 and -1 are perfectly strong

Question 7

How do we find the dispersion?

Answer 7

Standard deviation and IQR

(takes the third quartile value and subtracts the first quartile value. )