# HSCI 307 Lecture Notes - Lecture 11: Alternative Hypothesis, Standard Error, Statistical Hypothesis Testing

## Document Summary

Data: numbers that represent some feature of the thing you are measuring. Measurement: the process of assigning numbers to the thing. Graph data with some common tools that allow you to see data patterns. Interval: nominal + in order + equally spaced. Ratio: nominal + in order + equally spaced + a meaningful zero. Discrete: who number, no value between the whole numbers. 95% ci: 95% of the time the true value in the population will be contained in the interval if the study were to be repeated many times. Descriptive statistics: happen to describe properties of the data and their distribution. Correlation coefficient: straight line relationship between two variables. Minimum ~ maximum ~ range - a measure of variation. Standard deviation: how much each observation varies from the mean. Three number report: sample size, median, iqr (interquartile range) Measure of symmetry - skewness (-1 ~ 1)