The star schema is just a bit flat table transformed into 

Makes the use of the data model more efficient.

Attributes such as 'Age' are put in the dimensions not in the fact table. 

Look up a factless fact table. 

First create a Respondent table with 

• RespondentID

• Name

• Age

• Height

Next create another table with "Questions"

• QuestionID

• RespondentID

• Answers