Hypothesis Testing

Question 1

what are types of parametric tests?

Answer 1

• one sample t-test
• two-sample t-test
• paired sample t-test
• ANOVA
• Pearson Correlation Coefficient

Question 2

parametric tests

Answer 2

assume that data follows a specific distribution, usually the normal distribution, and that certain parameters are known or can be estimated

used to make inferences about population parameters based on sample data

Question 3

parametric tests are based on the normal distribution and require the following assumptions…

Answer 3

• both the data or residuals should follow a normal distribution
• the variance across different groups or levels of an independent variable should be roughly equal
• the data should be randomly sampled
• each data point must be independent of others
• there should be a linear relationship between variables
• data should be measured on an interval or ratio scale

Question 4

how can you check if data is normally distributed?

Answer 4

• graphical displays (Q-Q plot and
• skewness and kurtosis values

Question 5

what are some graphical displays to assess normality of parametric tests?

Answer 5

• Q-Q/P-P plot and histogram

Question 6

what is a Q-Q/P-P plot?