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