Statistics

Question 1

Speed test vs power test

Answer 1

ST - Result is dependent on time; low item difficulty

PT - time limited; steeply graded difficulty; may include items that are too difficult

Question 2

Contingency Coefficient

Answer 2

Measure of correlation between two variables with each going into two or more variables

Question 3

In Chi-squared, Spearman’s and parametric tests, to be significant the observed value should be ____ to the critical table value.

Answer 3

Greater than or equal

Question 4

One tailed test

Answer 4

Used for a directional hypothesis (more, greater, slower, positive, negative, etc.)

Question 5

Two tailed test

Answer 5

Use for non-directional hypothesis; suggests that there is a relation but does not say in which direction

Question 6

Chi squared

Answer 6

Goodness of fit test that determines if sample data matches a population.

Test of association; used when data is nominal and expressed as frequencies

Frequencies re-recorded on a contingency table

Question 7

Degree of freedom

Answer 7

Number of boxes with data in them in the contingency table

Df = (no. of row - 1) x (no. of columns - 1)

Question 8

Contingency table

Answer 8

Aka crosstabs or two-way tables; used to summarize the relationship between several categorical variables.

A special type of frequency distribution table, where two variables are shown simultaneously.

Question 9

Standard error

Answer 9

Standard deviation of a distribution of sample means