Dataset: apple_sales.dat Source: W.S. Hoofnagle (1965). "Experimental Designs in Measuring the Effectiveness of Promotion," Journal of Marketing Research, Vol. II, pp. 154-162. Description: Apple sales (pounds) over 3 time periods in 9 stores (3 per latin square) and 3 color ranges of red apples (1=75-100% good color, 2=50-75%, 50-100%). Variables/Columns Square 8 Store 16 Period 24 Color Range 32 Sales 36-40