class: center, middle, inverse, title-slide # Delivering Presentations ### Yue Jiang ### STA 440 / Spring 2025 --- ### Delivering presentations - Be **direct** - Be **clear** - Be **confident** .question[ Focus only on **what matters** ] --- ### Answering questions You are the consulting statistician for a credit card company. You have been asked to evaluate the effectiveness of a targeted campaign aimed at increasing enrollment in a monthly benefit program (e.g., "click here to register for 5% off purchases at Shake Shack"). In this campaign, half of the customers were randomly selected to receive an email message regarding the program, and the other half received text messages. --- ### Answering questions 22% of the customers receiving emails enrolled in the program; 19% of the customers receiving texts enrolled in the program. In reporting this finding, you conducted a chi-square test and found that the p-value was 0.16. > **Marketing team**: *Our A/B test showed there is no difference between the groups.* You: "This is not an appropriate conclusion to make from the test." > **Marketing team**: *Why not? The probability that the two proportions are the same is 0.16, which is higher than 0.05. Isn't this enough evidence to say that the two campaigns are the same?* .question[ What do you say next? You have up to 150 words. ] --- ### Explaining concepts In up to 150 words, describe the following concepts to a non-statistician. - p-value - Confidence interval - Interaction (as in regression modeling) - "Controlling for other variables" - Selection bias .question[ Everyone will be asked to share their responses in front of the class. ]