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February 28, 2015

Homework Help: statistics

Posted by alex on Wednesday, April 6, 2011 at 4:12pm.

You are a travel agent and wish to estimate, with 98% confidence, the proportion of vacationers who use an online service or the Internet to make travel reservations. Your estimate must be accurate within 4% of the population proportion.
a) No preliminary estimate is available. Find the minimum sample size needed.
b) Find the minimum sample size needed, using a prior study that found 30% of the respondents said they used an online service or the Internet to make travel reservations.
c) Compare the results form parts (a) and (b).

Show steps please, I really need help I don't understand how to set this up or solve it at all!

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