Week 3

In this week we are introducing the concept of inferential statistics. That is to be able to answer a specific question based on observed data. Biological or scientific questions are, in statistical terms, formulated as a hypothesis, which can be tested using data. One of the most widely used tests, are the t-test for comparison of the mean from two distributions.

Hand-in assigment

Exercise 10.3 Diet and Fat metabolism - T test - in R is to be handed in (through absalon or as hard-copy Wednesday night). You are welcome to put in R-code in the assignment, but it is your argumentation and interpretation that are the most important.

Important

Complete Exercise 10.2 prior to the hand-in assignment to make sure you understand what R does during a t-test.

Exercises

For Monday work through the following exercises:

• Exercise 10.1
• Exercise 10.2
• Exercise 10.4
• Exercise 10.5

For Wednesday work through the following exercises:

• Exercise 10.7
• Exercise 10.8
• Exercise 11.1

Case II

The second case is described in the document “Case II.pdf”. You should work on the case in groups of four, and hand in a slide-show with voice no later than Thursday evening next week.