You choose your countrys currency for example. You download weekly exchange rate between your currency and US dollar in one year.

Using the Descriptive Statistics option in the Data Analysis menu to calculate its mean, SE, median, skewness, kurtosis, Min, Max, count, etc.

Drawing a Line Chart (Time Series) of your data

Find out the interest rate of America and your country

How can you arbitrage the situation if we expect the exchange rate of your countrys currency and US dollar to decrease by 5% in a year? How about increase by 5%?