lecture-1

lecture-1 - Statistics with Applications in the Biological...

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1 Statistics with Applications in the Biological Sciences (STAT 350, 2010) Lecture 1 Outline z Introduction to Statistics coverage: chap 1 + additional materials 1.1. Variation in data: (motivation) One group, two groups 1.2. What is statistics? What does it do? (its role in science) 1.3. Key ideas in statistical reasoning. Coin example, idea Study design Æ Stat. analysis z Statistical Language - coverage: chap 2.1 2.1, Variable and notation 2.2, Measurement scale
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2 1.1. Nature Variation in Data - one group Eg 1 , Coin Tossing (classical example) z H = head, T = tail Experiment: toss a coin 8 times, results: Data = H H H H H H H H 100% heads Æ No Variation Data = T H H T T H T H 50% heads, 50% tails Æ Variation Nature Variation in Data - one group Eg 2 , Pizza Size If 10 of you ordered five 18” pizzas at PizzaHut and watch games together, you rarely get five pizzas with extra same size (diameter). Instead, you could get: 17.5”, 17.9”, 18.5”, 18.2”, 17.8”. Source of Variation Æ diameters vary
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3 Nature Variation in Data - two group Eg 3 , Textbook Example 1.2 – Bacteria and Cancer Responses vary in both exposure and no exposure groups. (Given same treatments, mice respond differently)
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This note was uploaded on 12/09/2010 for the course BIOL 442 taught by Professor Brewster,r during the Spring '08 term at UMBC.

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lecture-1 - Statistics with Applications in the Biological...

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