Psych 122 Stats

Question 1

cor.test
(and type of samples used on)

Answer 1

tests for association between paired samples using spearman’s rho or Pearson’s r

Question 2

qqPlot( )

Answer 2

Checks whether data is normally distributed

Question 3

lm( )

Answer 3

Used to fir the linear model and carry out regression and analysis of covariance

Question 4

cramersV( )

Answer 4

Calculates cramer’s V which is a measure for effect size of chi squared

Question 5

Assumptions of correlations

Answer 5

1. variables are at interval level
2. Data is continuous and numerical
3. Data is normally distributed
4. Relationship is linear

Question 6

What is the assumption for regression analysis

Answer 6

Assumes the residuals are normally distributed

Question 7

Which tests are non- parametric tests?

Answer 7

Spearman’s rho and Pearson’s r

Question 8

How to calculate Bonferrroni

Answer 8

Bonferroni= alpha level (0.05) / no. of variables

Question 9

Why do we use Bonferroni principles

Answer 9

When conducting multiple chi squared analyses, the significance levels is adjusted to control for a type 1 error

Question 10

What is a hetroscedastic?

Answer 10

Indicates a pattern with a bow tie/fan shape

Question 11

Type 1 error

Answer 11

False Positive
wrongly reject the null and accept the alternative hypothesis

Question 12

Type 2 error

Answer 12

False Negative
Failure to reject the null hypothesis when it is false