HSS 2381 Chapter Notes - Chapter 5: Probability Density Function, Null Hypothesis, Standard Score

• School: University of Ottawa
• Department: Health Sciences
• Course: HSS 2381
• Professor: Eleanor Riesen

Document Summary

Probability of an event (p) is expressed as a proportion. Ex: the probability of drawing a red card from a normal shuffled deck: Total number of possibilities = 52 = p = . 50: the(cid:396)e"s 5(cid:1004)-50 chance that card will be red suit. Formula: p = p (a) p (b) The probability of drawing two red cards consecutively: P (red, then red) = p (red) p (red) = . 50 . 50 = . 25 = p = . 25: chance of drawing 2 red cards in a row. Null hypothesis (h0) deck is fair (cid:374)ot (cid:862)(cid:396)igged(cid:863) Probability distributions graph probabilities of all events that could occur; similar frequency polygons. Total area of a probability distribution = 1. 0. Probability density function: probability distribution for continuous variables. Normally distributed continuous variables under the curve can be determined by converting raw scores to z score. Ex: a distribution of iq scores for a population of 10,000 10-year-old children.