PSCI 2702 Lecture Notes - Null Hypothesis, Interval Estimation, Interval Ratio
7 Jul 2014
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Class 5 psci2702a february 5, 2014. Two types of means: sample mean (based on observations in sample) and population mean (average for whole population). We do not know population average; this is why we need to estimate it with the sample mean. Can calculate the mean only for an interval ratio variable. Want to prove my research hypothesis, i. e. , reject the null hypothesis. Statistical significance means you can actually generalize to the whole population. Random chance means that a sample is not generalizable because of errors in sampling (choosing only certain groups). Null hypothesis is proven by random chance: if the significance < 0. 05, then i can reject the null hypothesis. Shows what the likelihood of the null hypothesis being true. Must be aware of the size of your sample size; a low sample size is not generalizable. Code all dissatisfied as 2, and ignore other categories.
