PreparED Study Materials
ST 421: ST 421
School: North Carolina State University
Number of Notes and Study Guides Available: 2
Notes
Videos
Battery Lifetimes: Mean, Variance & Standard Deviation
Want To Learn More? To watch the entire video and ALL of the videos in the series:
Discover the nuances of analyzing battery lifetime data through mean, variance, and standard deviation computations. Using class boundaries, midpoints, and frequencies, gain insights into the dispersion of battery lifespans and the average deviation from the mean.
Eye Color & Assortative Mating in Scandinavian Couples
Want To Learn More? To watch the entire video and ALL of the videos in the series:
Explore the concept of assortative mating through an eye-color study of 204 Scandinavian couples. Discover how probabilities highlight nonrandom mating patterns. Conclude if eye colors of partners are independent or reveal assortative tendencies.
42.1 Web Visits: How It Stacks Up to U.S. Average
Want To Learn More? To watch the entire video and ALL of the videos in the series:
Explore how hypothesis testing is used to compare a sample mean of Internet visits to the national average. Through calculations and statistical analysis, we determine if a sample of users' web usage significantly deviates from the average U.S. web usage.
Understanding Delaware's Income Distribution: A Statistical Look
Want To Learn More? To watch the entire video and ALL of the videos in the series:
Analyze Delaware's per capita annual income using statistical methods. Understand the probabilities associated with various income levels for a sample of state residents. Learn to use the Z score formula for such evaluations.
Brand X vs. Brand Y: 95% Confidence in Voltage Difference
Want To Learn More? To watch the entire video and ALL of the videos in the series:
Compare the voltages of Brand X and Brand Y batteries using statistical analysis. Learn how to determine a 95% confidence interval for their mean differences. Understand the process from data collection to interpretation of results.
Calcium in Chautauqua's Rain: 1990 vs. 2010 Analysis
Want To Learn More? To watch the entire video and ALL of the videos in the series:
Explore the calcium concentration in Chautauqua's rainwater from 2010, comparing it to 1990 levels. Using statistical tests, examine normal distribution and determine significant changes. The results provide insights into environmental shifts over two decades.