Survey: Sales Approach In a sales effectiveness seminar, a group of sales representatives tried two approaches to selling a customer a new automobile:

the aggressive approach and the passive approach. For 1160 customers, the following record was kept:

Sale No Sale Row Total Aggressive 270 310 580 Passive 416 164 580 Column Total 686 474 1160 Suppose a customer is selected at random from the 1160 participating customers. Let us use the following notation for events: A 5aggressive approach, Pa 5passive approach, S 5sale, N 5no sale.

So, P(A) is the probability that an aggressive approach was used, and so on.

(a) Compute P(S), P(S | A), and P(S | Pa).

(b) Are the events S 5sale and Pa 5passive approach independent? Explain.

(c) Compute P(A and S) and P(Pa and S).

(d) Compute P(N) and P(N | A).

(e) Are the events N 5no sale and A 5 aggressive approach independent? Explain.

(f) Compute P(A or S).

AppendixLO1