University:
York University
Course:
PSYC 2021 | Statistical Methods I
Academic year:

2024
Views:

15

Pages:

3
Author:

Nick T.

Probability and Z-scores Probability • the Chance of an event occurring probability of 19 = number of outcomes A/number of possible outcomes p(king) = 1/52; the probability of selecting the king of hearts from a deck of cara - place) = 1/52; the probability of selecting an ace from a deck of cards part of a whole ranges from zero (will not happen) to one (will happen) always positive; always sums to one (100%) Example I probability experiment "the bag has lo mitm's; one of each color pull an orange mitm out of the bag without looking • Sample space (possibilities) brown, red, green, yellow, Orange, bive probability p(0)= Example 2 probability experiment pull an orange or yellow mitm out of the bog without looking Sample Space brown, red, green, yellow, orange, blue probability Probability Distribution • discrete probability distribution visually Shows the probability of each value a random variable can assume mean of the probability distribution - Μ.ΣΧ.Ρ(x)] Variance of the probability distribution ([x-P(x)]) - μ' Example 3 Example 4 Tind the womancayofumber of spo ΣΑΡ) Unit Normal Distribution Symmetrical S - left and right side of the distribution have the same ares • Standardized percentages apply to any normal distribution Separated into two sections - body: larger portion; tail: smaller portion • probability is equivalent to proportion