Example 3.23

EXAMPLE 3.23

Select an SRS of countries using Excel. The data file TTS includes columns for the country name and a three-letter country code for each of the 189 countries. We could use either of these for our label. We will use the three letter codes in our screen shots to save space.

Figure 3.7(a) shows the codes for the first ten countries. In Figure 3.7(b), we show the uniform numbers generated with the RAND() function (and then pasted into column C). The first three countries are Afghanistan (AFG), Angola (AGO), and Albania (ALB).

192

Figure 3.7 Selection of a simple random sample of countries from the population of 189 countries, Example 3.23.

Figure 3.7(c) shows the file after we sort on the uniform random numbers in column C. Our sample is the first 25 countries in the sorted file. The first three selected are Chile (CHL), Belgium (BEL), and the Solomon Islands (SLB). Note that Excel does not display the last two digits for Belarus (BLR) because they are zero.