Statistical Investigation: Confidence Intervals and Hypothesis Testing
VerifiedAdded on 2021/04/17
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Homework Assignment
AI Summary
This document presents a comprehensive solution to a statistical investigation assignment. It begins with an analysis of confidence intervals and z-scores, calculating sample sizes and evaluating the correctness of statistical statements related to normal distributions. The assignment then progresses to a two-part problem. The first part involves analyzing customer satisfaction data from two regions, including calculating unbiased estimates, conducting F-tests for variance, and performing t-tests for means. The second part focuses on hypothesis testing for proportions, determining whether the proportion of satisfied customers has decreased. The solution includes detailed calculations, test statistics, p-values, and critical values, along with interpretations of the results. The document concludes with a discussion on the impact of sample size on standard error and a comparison of critical values between t-tests and tests based on the central limit theorem. References and appendix with supporting statistical output are also provided.
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