CRIM 220 Lecture 3: CRIM 220 LEC3
13 Jun 2016
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2 types of empirical questions: descriptive qs. Can use descriptive answers to predict outcomes: causal qs. Ask how a particular change in one variable would impact another variable. Causal: 1 variable causes another variable to change. Correlation between cause and effect is not due to some other factor(a 3rd variable) Whether statements about a given cause and effect true(valid) or false(invalid) Ability to determine whether a change in the cause (iv) is statistically correlated with a change in the effect (dv) Sample size important; relates to issue of power. Population : all ~ 200,000 hs students in bc. Power: a statistical test that relates to sample size. The power is a test is how likely the test will be able to fine a statistically significant different betw. the groups in your sample given the size of the different betw. the groups in the population. A priori: to determine necessary sample size for desired level of power.
