Week3[1]

# Week3[1] - Week 3 Probability Theory What Is Probability...

This preview shows pages 1–8. Sign up to view the full content.

Click to edit Master subtitle style Larson/Farber Ch. 3 Week 3: Probability Theory What Is Probability Probability Rules Contingency Tables Beyond the Basics: Chi-square Tests

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Larson/Farber Ch. 3 What Is Probability l Probability (P) is always expressed as a value between 0 and 1 (0% to 100%). l Probability is the likelihood that an event of interest will occur.
Larson/Farber Ch. 3 Statistical Experiment l A statistical experiment in an activity that results in an outcome l Sample space -- the set of all possible outcomes for the experiment l Event -- outcome of interest, usually express as the P (event A) or P(A)

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Larson/Farber Ch. 3 Classical (equally probable outcomes) space sample in outcomes of Number E event in outcomes of Number P(E) = Frequency Total E event of Frequency P(E) = Probability blood pressure will decrease after medication Probability the line will be busy Empirical Intuitio n Types of Probability Probability that of rolling a 4 on a single roll of a die
Larson/Farber Ch. 3 Relative Frequency l Probability of an event = f / n = relative frequency f is the frequency of an event n is the sample size l Relative frequency distributions (histograms) of samples are probability distributions Class Midpoint # of Videos % of Videos 25 -34 29.5 3 10.71% 35 - 44 39.5 8 28.57% 45 - 54 49.5 8 28.57% 55 - 64 59.5 5 17.86% 65 - 74 69.5 3 10.71% 75 - 84 79.5 0 0.00% 85 - 94 89.5 1 3.57% Total 28 100.00%

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Larson/Farber Ch. 3 Properties of Probability l P (A) denotes the “ probability of event A” l P is always a number greater than 0 and less than 1 l The sum of the probabilities of all outcomes in a sample space must equal 1 l P (not A) = 1 - P (A) this is the complement of an event; also designated as P (A’) or “probability of A prime”
Larson/Farber Ch. 3

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 20

Week3[1] - Week 3 Probability Theory What Is Probability...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online