Parametric Hypothesis testing

Question 1

What two values does probability lie between?

Answer 1

0 and 1

0. 1 - 10% chance
1. 5 - 50% chance

Question 2

What does the P value represent?

Answer 2

the probability of getting the observed result if the null hypothesis is true

Question 3

what does a p value of 0.01 mean?

Answer 3

there is a 1% chance/probability of getting the observed result if the null hypothesis is true

Question 4

What requirements must be met to carry out an independent t test?

Answer 4

• dependent variable that is continuous - interval/ratio level
• independent variable that is categorical - two groups
• independent groups
• random sample of Data from the population
• normal distribution of dependent variable for each group
• no outliers
• homogeneity of variance

Question 5

What are an independent t common applications?

Answer 5

• comparison of two groups

- e.g. treatment vs control

Question 6

roughly what percentage of the population falls in the normal distribution of 1, 2 and 3 SD’s?

Answer 6

• 1 sd - 68.3%
• 2 sd - 95.4%
• 3 sd - 99.7%

Question 7

What requirements must be met to carry out a paired samples t test ?

Answer 7

• dependent variable that is continuous - interval/ratio level
• related samples/groups
• Random sample of data from population
• Normal distribution of the difference between the paired values
• no outliers in the difference between two related groups

Question 8

What is the non parametric alternative for an independent and paired samples t test?

Answer 8

independent t test - Maan-Whitney U test

dependent / paired samples - Wilcoxon