PSY 3001W Lecture Notes - Lecture 8: Statistical Parameter, Spurious Relationship, Statistic
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What does that tell you about the distribution: measures of variability. Variance, standard deviation, range: line regression, finding the best-fitting line. Regression coefficients: slope and intercept, y=a+bx, b=slope, a=intercept, positive slope, positive or direct relationship, negative slope, negative or inverse relationship, correlation, pearson product-moment correlation coefficient (r). 1 < (or equal to) r < (or equal to) 1: 2 pieces of information we can get from r. Ex: positive correlation between a city"s ice cream sales and drownings in city pools, both are related to outdoor temperature, making decisions about statistical significance, when doing a t-test by hand. Given a probability (alpha), find t-value (tcrit) so you can compare it to t(obs): doing a t-test in spss. Select alpha (level of significance) 0. 05. Enter your data in spss, click on t-test. Spss computes t(obs) and tells you the probability of obtaining t(obs) by chance (p-value): determine if the p-value (probability of obtaining t(obs) by chance) is less than alpha.
