pooled vs unpooled

Can you give an example of the kind of test you have in mind, so we can know what sort of "pooled or unpooled" you are asking about? Specifics can help in communication.
 
For this below question how do I know whether to use pooled or unpooled for the hypothesis test and confidence interval?

Carpal tunnel syndrome is a painful wrist condition that can be treated with surgery or less invasively with wrist
splints. In a study of 180 patients with the condition, half had surgery and half used wrist splints. In the surgery
group, 65 patients showed improvement after three months while 42 of those who used wrist splints improved.
Is surgery
more effective than the use of wrist splints for patients with this condition?
a)
Write appropriate hypotheses.
b)
Test the hypotheses, find the P-value
and state your conclusion
in plain English. Use α = 0.01.
c)
Create a 98% confidence interval for the difference in
proportions of patients showing improvement, and interpret your interval.
d)
Comment on your interval in relation to your conclusion from part b)
 
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