Question

124) A television channel has claimed that on average a teenager spends 7 hours
each month on viewing its entertainment programs. An advertising agency wants to
carry out a survey to assess the reasonableness of the above claim. Determine the
size of the sample which would be needed in order to assert with 99% confidence
that the error in the above claim does not exceed 30 minutes. Assume that o=3.2
hours.
a) 271
c) 172
b) 272
d) None of these​

Answer 1

Answer:

Your correct answer is b