These are the two word problems:

"A tablet PC manufacturer wishes to estimate the proportion of people who want to purchase tablet PCs which cost more than $700. Find the required sample size to yield a 90% confidence interval whose length is below 0.04."

"In estimating a population proportion using a large sample, the value of is assumed to be 0.35, and its 95% error margin is 0.02. Find the sample size to meet the error margin."

Do I use the same formula for them?

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