Question

Select a variable (mean, proportion, variance or standard deviation) of interest to you and collect data consisting of at least 30 values.

Define the variable.
Define the population.
Describe how the sample was selected.
Use Microsoft Excel (and MegaStat if at all possible) to determine the confidence interval.
Comment on what you find.

Answer 1

What variable do you want to select? Easier ones might involve heights or ages of students in your class to use as a sample for your college population.

Answer 2

In this assignment, you have to decide what you are going to measure and make your own measurements.

You could choose, for example, number of words in thirty consecutive sentences in a book or newspaper article.

For the confidence interval calculation, try
http://www.dimensionresearch.com/resources/calculators/conf_means.html

You can find many other calculating tools with a Google search.