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8. To do this, a simple random sample could be used. The population could be divided into subgroups called strata In this case, the strata would be Americans between the ages of 15 and 24 that have listed land lines, those that have cell phones only, and those that have no phone. 9. Once the strata are formed, individuals would be selected from each strata proportionately to the population. For this group, 90% of the sample should be from the group with listed land lines. That means, for a sample size of 1500, individuals should be chosen from that group. 9% of the population has a cell phone only, so individuals should be chosen from that group. 1% of the population had no phone, so individuals should be selected from that group. Hint: To find the number of individuals selected from each group multiply the sample size by the percent. Don't forget to change the percent to a decimal before you multiply. Check