Sampling variability In thinking about Gallup’s sample of size 1523, we asked, “Could it happen that one random sample finds that 57% of adults recently bought a lottery ticket and a second random sample finds that only 37% had done so?” Look at Figure 5.6 (page 224), which shows the results of 1000 samples of this size when the population truth is 60%. Would you be

surprised if a sample from this population gave 57%? Would you be surprised if a sample gave 37%?

Population parameter (a) Population parameter (b) Population parameter Population parameter (c) (d)