PSYC 101 Lecture Notes - Lecture 5: Descriptive Statistics, Statistical Inference, Frequency Distribution

• School: UBC
• Department: Psychology
• Course: PSYC 101
• Professor: Luke Clark

Document Summary

Descriptive statistics to capture the essential information from a frequency distribution; to summarize and examine the sampled data. Inferential statistics mathematical tools that help us make decisions with data; to use sampled data to make reasonable inferences about the greater population. Central tendency statements about the value of the measurements that tend to lie near the centre or midpoint of the frequency distribution. Mean: the average value of all measurements. Mode: the value of the most frequently observed measurements. Standard deviation: a statistic that describe the average difference between the measurements in a frequency distribution and the mean of that distribution. Normal distribution, bell curve, gaussian distribution . The frequency of measurements is highest in the middle and decreases symmetrically in both directions. Third-variable problem two variables are correlated only because each is casually related to a third variable. To determine whether there are meaningful differences in our sample.