W5 Independent & Paired Samples T-tests

Question 1

What are the two types of Samples T-tests?

Answer 1

1. Independent Samples T-test
   - Data from two different groups of people
2. Paired Samples T-test
   - One group, each person provides two bits of data
   Tip: Pair of shoes = two shoes belonging to one person

Question 2

What is a Null Hypothesis?

Answer 2

• A hypothesis with no difference between means and no relationship between variables

Question 3

What is an Alternative Hypothesis?

Answer 3

• A hypothesis that will have a difference between means and will have a relationship between variables

Question 4

Give 3 assumptions of a Paired Samples T-test

Answer 4

• Data is continuous/scale (ratio or interval)
• ‘Differences’ are normally distributed
• No significant outliers in the ‘differences’

Question 5

What is degrees of freedom?

How do you calculate degrees of freedom?

Answer 5

• The number of observations that are free to vary

- The mean - 1

Question 6

Give 3 assumptions of an Independent Samples T-test

Answer 6

• Data is continuous (ratio e.g. height or interval e.g. temperature)
• Both groups are a random sample of a population
• Homogeneity of variance (both groups have equal-ash variances)