PreparED Study Materials
STAT 208: Statistics
School: Northern Illinois University
Number of Notes and Study Guides Available: 2
Notes
Videos
Analyzing Ford F-750 Mileage Using Z-Scores & Probabilities
Want To Learn More? To watch the entire video and ALL of the videos in the series:
full solution
Explore how z-scores help analyze the mileage of Ford Super Duty F-750 trucks. Discover the percentages that reached specific mileage markers and grasp the significance of data using the z-table.
Analyzing Movie Habits Survey: Uncovering Hidden Biases
Want To Learn More? To watch the entire video and ALL of the videos in the series:
full solution
Unpack the potential biases in a survey about movie-watching habits based on its design and constraints. Learn how limiting to residential phones and specific time frames can affect results. Recommendations are made to ensure a broader, more accurate perspective.
Crunching Car Sales Data: Size, Color, and Probability Insights
Want To Learn More? To watch the entire video and ALL of the videos in the series:
full solution
Uncover the likelihood of different car combinations by size and color from a dealer's sales data. Learn how to calculate probabilities, from the chances of a small car being black to the odds a non-small car isn't gray. An insightful look into understanding car preferences.
Electronic Failures: Deciding Between Minor & Major Defects Cost-Effec
Want To Learn More? To watch the entire video and ALL of the videos in the series:
full solution
Discover the intricacies of determining the cause of electronic system failures, either minor or major defects, using statistical distributions. Learn how to minimize the expected cost and make informed decisions based on soundings and loss tables
Battery Lifetimes: Mean, Variance & Standard Deviation
Want To Learn More? To watch the entire video and ALL of the videos in the series:
full solution
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.
Thread Strength After Heat Treatment: A 99% Confidence Analysis"
Want To Learn More? To watch the entire video and ALL of the videos in the series:
full solution
Explore the impact of heat treatment duration on thread breaking strength. Using statistical analysis, we assess the difference in mean strengths between batches. Confidence intervals help quantify this difference with 99% certainty.

