What This Document Is
This document provides an answer key for case exercises found in Chapter Two of Business Analytics for Decision Makers (BUS DM 501) at Northwestern University. It focuses on applying statistical concepts – specifically confidence intervals and hypothesis testing – to real-world polling data from the 2003 California gubernatorial election.
Why This Document Matters
This resource is essential for students enrolled in BUS DM 501 who are working through the course materials. It allows learners to check their understanding of how to interpret statistical results and assess the significance of observed differences in data. It’s particularly useful when applying these concepts to scenarios involving sample proportions and potential biases. This answer key is intended to be used *after* attempting the case exercises independently.
Common Limitations or Challenges
This document does *not* provide a tutorial on the underlying statistical principles. It assumes a foundational understanding of confidence intervals, standard deviation, and hypothesis testing. It also doesn’t explain the broader context of the California election or the implications of the polling data beyond the statistical analysis. Users will still need the original case exercises and textbook to fully benefit from this resource.
What This Document Provides
The full answer key includes detailed calculations and explanations for the following case exercises:
* Analysis of the “Gender Gap” in voter preferences for candidates Cruz Bustamante, Arnold Schwarzenegger, and Tom McClintock.
* Calculations of standard errors and margins of error for different sample sizes and proportions.
* Hypothesis tests to determine the statistical significance of observed differences between subgroups (men and women).
* Discussion of best practices for presenting statistical results to a non-technical audience.
This preview *does not* include the complete calculations or the full explanations for each step in the hypothesis tests. It is designed to give you a sense of the types of problems addressed and the level of detail provided in the complete answer key.