GEOG 3222 Lecture Notes - Lecture 5: Statistical Parameter, Null Hypothesis, Means Test
26 Feb 2017
School
Department
Course
Professor
Document Summary
Hypothesis statement: null hypothesis, h0: no difference between population and sample mean, alternate hypothesis, ha: difference between population and sample mean. Level of significance: the value chosen to define the level of error that the user allows (0. 20, 0. 10, 0. 05, 0. 02, 0. 01) these are unit less values, and (1-a)=confidence level; see table 8. 3: 123. Decision rule statement: set the boundaries to which the calculated test value is being compared to make a decision about rejecting the null hypothesis. Example: difference of mean test for example, if z < -1. 96 or if z > 1. 96, reject h0; Conversely, if -1. 96 z 1. 96, do not reject h0. 2: consider the appropriate equation for calculating the test statistic or select the appropriate software module. Care for the notations being used in equations. Degrees of freedom (df): number of independent observations used into the estimate of a variable. Given by n-1" for each sample being tested, where n: sample size.
