A hair salon completed a survey of customers about satisfaction with service and type of customer. A walkin customer is one who has seen no ads and not been referred. The other customers either saw a TV ad or were referred to the salon. The results are in the following table. Assume the table represents the entire population of customers surveyed. Find the probability that a customer was:
Walk – in 
Tv ad 
reffered 

Not satisfied 
12 
9 
3 
Neutral 
18 
15 
27 
satisfied 
31 
28 
59 
Very satisfied 
29 
31 
48 
Satisfied/very satisfied, given he or she was referred
Using your answers in the previous questions, does customer satisfaction depend on whether or not the customer was referred? Explain your answer.v
given that
total number of observations=N=310
let S means satisfied
VS means very satisfied
R mean referred
so
n(S and R)=59
n(VS and R)=48
n(R)=137
we have to find P(SR)
now
we have to find P(VSR) now
since here we see that probability of Satisfied given that referred is more than that probability of very satisfied
means there is a difference in probabilities of the level of satisfaction given that it referred hence satisfaction is depend on wheather customer is referred or not.
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