Week 5

Question 1

Power

Answer 1

Refers to the probability of rejecting the null-hypothesis.

Question 1

Null-hypothesis

Answer 1

Proposes that the researched effect does not exist.

Question 2

Type I error

Answer 2

Rejecting the null-hypothesis while it should actually be adopted.

Question 3

Type II error

Answer 3

Adopting the null-hypothesis while it should actually be rejected.

Question 4

Median score

Answer 4

Midpoint of the distribution of answers.

Question 5

Mode score

Answer 5

Most frequently chosen answer.

Question 6

MCAR

Answer 6

Mossing completely at random, the probability of being missing is the same for all cases. Does not depend on observed or unobserved variables.

Question 7

MAR

Answer 7

Missing at random, probability of missing is not the same for all cases. Depends on the observed variable.

Question 8

MNAR

Answer 8

Missing not at random, the probability of missing is not the same for all cases and may depend on missing information. Depends on the observed and unobserved variable.

Question 9

Levels of variables

Answer 9

1. Nominal - no order, e.g. hair color
2. Ordinal - has order, e.g. education level
3. Discrete - represents counts, e.g. the number of babies born
4. Continues - represents measures, e.g. the weight of the babies born

Question 10

X2 test (CHI)

Answer 10

Tests whether or not an observed frequency distribution differs from a theoretical frequency distribution.