Economic/Statistic Problems

• Discuss how the size of a sample affects conclusion through the examination of a study’s confidence intervals.
• Evaluate research questions through the completion of appropriate hypothesis testing involving two samples.

Read the Faber (2014) article on the influence of sample size and then the Boffetta et al (2010) article of the relationship between fruit and vegetable consumption and reduced cancer risk. Examine
the confidence intervals reported in the abstract (note that a hazard ratio (HR) of 1 means no change in risk) and comment on their sizes. Are they statistically significant? How does the size of
the samples affect your opinion of the conclusions reached?