Answer:
The correct answer to the following question will be "90% = 5%" and "95% = 2.5%".
Explanation:
The given levels are:
90% and 95%
(a)...
At 90%, we get
⇒
=

then,
⇒

⇒
≅

∴ at 90% level of confidence 5% must be chopped off from each of the tail.
(b)...
At 95%, we get
⇒
=

then,
⇒

⇒
≅

∴ at 95% level of confidence 2.5% must be chopped off from each of the tail.