For proportion o always normal inferences about

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Unformatted text preview: estimates and confidence intervals for variance o Asymmetric (chi ­squared) o Obtain standard deviation from variance • Point estimates and confidence intervals for proportion o Always normal Inferences about differences between two populations • Point estimates and confidence intervals for difference between two population means o Variances known o Variances unknown but assumed equal o Variances unknown and possibly unequal • Point estimates and confidence intervals for difference between two proportions Inferences about the relationship between two variables • Point estimates and confidence intervals for slope & intercept of a linear relationship o Know how the point estimates are derived (minimizing squared errors) • Calculation and meaning of R ­squared o Relationship with correlation coefficient o Calculation via sum ­squared errors Continues on next page General concepts that apply to all inferences • Relationship between confidence and α • Finding the appropriate statistic for a certain α, degrees of freedom, and one or two tails • Number of samples required to achieve a certain confidence Hypothesis testing • Write a null hypothesis that opposes the idea you would like to “prove” • Choose a critical region in which the null hypothesis would be rejected • Type I versus Type II error...
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This document was uploaded on 03/06/2014 for the course CEE 202 at University of Illinois, Urbana Champaign.

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