STATISTICS 2 - BASIC PROBABILITY o o o o A random experiment is a process of making an observation or a measurement (called an outcome) in which the outcome cannot be predicted in advance with complete certainty. Therefore, we assign a probability (l
STAT 2 SOME COMMENTS AND WARNINGS CONCERNING INFERENCE
The confidence intervals and significance tests we have discussed concern the population mean and are based on the sample mean X . These mean-based inference procedures assume an SRS from a lar
STAT 2 INFERENCE BASED ON THE t DISTRIBUTION
The previous inference procedures based on the Z distribution assume that the population standard deviation is known. But if is not known, the t distribution must be used. Brief History: The t distributi
LINEAR REGRESSION You learned how a scatterplot can be used to determine if there is a relationship between two quantitative variables X and Y. In the simplest examples, the points in the scatterplot suggest that X and Y have a linear relationship, a