CAS PS 101 Lecture Notes - Kurtosis, Sleep Deprivation, Skewness
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CAS PS 101 Full Course Notes
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Collecting data by asking questions to determine levels . Always asking some empirical question; if then this , etc. Interrelated ideas used to explain a set of observations. Hypothesis: students who study over a span of 3 weeks before a test perform better than those who wait until the night before. Variable: anything we can measure (height, age, etc. ) Other variables that might affect the dependent variable. A physiologist sets to determine whether the caloric content of food is a determinant of the amount eaten by rats who have been subjected to 48 hours of sleep deprivation. Skewness & kurtosis: 2 statistics that tell us about the distribution data. Skewness: shifting of the data to the left or right. Kurtosis: peakedness of the data (too peaked or too flat) R. square statistic is the proportion of variance accounted for by the independent variables (anxiety, narcissism, etc. 95% chance that the association you"re seeing reflects a real association.