PreparED Study Materials
Notes
Videos
011 Car Colors in North America: Trends & Visual Insights
Want To Learn More? To watch the entire video and ALL of the videos in the series:
full solution
Discover the trends in car colors for North America in 2011. Break down the percentage distribution of various shades, from dominating whites to the less frequent greens. Understand the best visual techniques to represent this data, weighing the pros and cons of graphs.
Analyzing Age Distribution of Proofreaders: A Statistical Approach
Want To Learn More? To watch the entire video and ALL of the videos in the series:
full solution
Discover the statistical process behind analyzing the age distribution of proofreaders at a publishing company. Learn how to use the Z-score formula for individual and sample mean probabilities, and how to interpret results using a Z-table.
Analyzing Grade Variance: Is it More than Usual? A Chi-Square Test
Want To Learn More? To watch the entire video and ALL of the videos in the series:
full solution
Discover the process of analyzing variance in midterm grades with a Chi-Square test. Understand the significance of high variance and its implications. Follow along as we assess a professor's suspicion about unusually varied student performance.
Comparing Ages: Slot Machine vs. Roulette Players
Want To Learn More? To watch the entire video and ALL of the videos in the series:
full solution
Examine the mean ages between two distinct groups: slot machine players and roulette enthusiasts. Utilizing the independent sample t-test, evaluate if there's a significant age difference between the two groups. The findings offer a nuanced understanding of player demographics in gaming environments.
Analyzing Student Homework Times: Quartiles & Data Insights
Want To Learn More? To watch the entire video and ALL of the videos in the series:
full solution
Examine a dataset that tracks student homework durations. Understand quartiles, the interquartile range, and skewness in the data. Discover insights into typical study durations and outlier behaviors.
Estimating Study Hours: A 99% Confidence Method"
Want To Learn More? To watch the entire video and ALL of the videos in the series:
full solution
Explore how a university dean estimates freshmen study hours using statistical methods. Understand the importance of z-scores, confidence levels, and sample sizes in making accurate predictions. Learn how to ensure results are within a desired error margin.














