# How to calculate the margin of error if the sample size is not given?

The mean and standard deviation of a random sample of $n$ measurements equal 33.9 and 3.3 respectively.

Construct a 95% confidence interval for $n = 100$.

Hence I am trying to calculate margin of error and then use that to derive the sample size and then to construct my diagram. But the information given seems not to be enough.

• Ehh... can you work the term $n$ into your answer? – Penguin_Knight Mar 3 '13 at 5:51
• But n is not given.They say it is n-100 which is confusing. – user2059072 Mar 3 '13 at 5:59
• I bet that's meant to say "n=100" – Glen_b Mar 3 '13 at 8:28