This is what the screen should look like for item A of assignment 15.

You enter the first pair, gdp_cap and lifeexpm, and Swap Pair if they are not in the correct order as shown above.
Then you enter the second pair, gdp_cap and lifeexpf, and Swap Pair if needed.

For item B, you use the Data Sort, Descending, move lifeexpf into the box, as on the handout. Then move lifeexpm. Write out by hand your results.