Final answer:
Bi in the provided formula represents the Binomial Probability Distribution Function, which is related to the attitudes towards a particular brand.
Step-by-step explanation:
In the formula AB=∑i=1nB∑ni=1BiX Ei, the symbol Bi represents the Binomial Probability Distribution Function related to the attitude toward a particular brand. Here X is a random variable indicating the number of people who will buy the product out of a sample, and Ei indicates the expected value of change in attitude measured. The entire expression suggests a summation across various factors influencing the attitude towards a brand.