This vintage 1977 manual titled "Calculating Better Decisions" by Texas Instruments is a must-have for anyone interested in calculator reference books.
From the cover: Whatever your field or profession, your calculator can help you use the power of statistics and financial math in making better decisions.
Step-by-Step Calculator Solutions for:
Forescasting Trends
Measuring Change
Predicting Investment Returns
Analyzing Relationships in Data
Verifying Quality & Performance
Testing Research Claims