... we can improve it with better labeling. What does it mean that Oscar has a 0 in the second column? What do those letters mean in the column labelled Type? We can guess, but only Paul would know for sure. To remove the ambiguity, we should use more meaningful names, improve the formatting, and add units, as in Table 2.2.

Table 2.2 Units and formatting make data self-explanatory.

Customer Club Member Date Type Brand Size Amount
Oscar No 5-22-15 Bike Colnago 58 cm $4,625.00
Karen Yes 6-3-15 Tube Conti 27 in $4.50
Karen Yes 6-15-15 Tire Michelin 27 in $31.05
Bob Yes 8-20-15 Bike Kestrel 56 cm $3,810.00

The meaning of the second column is clear in Table 2.2. A 0 in this column means that the customer who made the purchase is not a club ...

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