2.3 Analyzing Findings — Why Ice Cream Does Not Cause Crime | Psychology 2e

This lesson unpacks the tools researchers use to move from misleading patterns in raw data to genuine scientific truth. Starting with the famous ice cream and crime rate correlation, it walks through why our pattern-hungry brains constantly fool us — and how the rigorous architecture of experimental design bypasses that biological flaw. From operational definitions and random assignment to peer review and the replication crisis, this is a practical guide to evaluating evidence in everyday life. In this video: • Correlation vs. causation: why ice cream sales and crime rates track together, and the role of temperature as a confounding variable • The correlation coefficient (r), including a real University of Minnesota study on sleep deprivation and GPA • Illusory correlations and confirmation bias: why 40 meta-analyzed studies couldn't kill the full moon myth • How to build a valid experiment — operational definitions, independent vs. dependent variables, and controlling everything else • Single-blind vs. double-blind designs, and how placebo controls mathematically isolate a drug's true chemical efficacy • Statistical significance (p less than 0.05), peer review, and the replication crisis — including p-hacking and the retracted vaccine-autism study • Reliability vs. validity illustrated with a broken kitchen scale, and the challenged predictive validity of the SAT/ACT #OpenStax #Psychology #ResearchMethods #ConfirmationBias #Statistics OpenStax Content adapted from "OpenStax Psychology 2e", by OpenStax licensed under CC BY 4.0. Content based on Web Version: Apr 23, 2026. Read the textbook online https://openstax.org/details/books/psychology-2e Music first girl talking to me. by ikkun (ex. Barradeen) | https://soundcloud.com/ikkunwastaken Royalty Free Music by https://www.free-stock-music.com Creative Commons / Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0) https://creativecommons.org/licenses/by-sa/3.0/deed.en_US