Final answer:
The most important physical attribute for soccer is muscular endurance for the lower body, which supports sustained play and powerful kicks. Data on heights can be gathered using a stratified random sampling from soccer leagues.
Step-by-step explanation:
The physical attribute that is most important for soccer is muscular endurance for the lower body. Soccer players benefit greatly from having a well-developed endurance capacity in their leg muscles to sustain continuous play, perform repeated sprints, and make powerful kicks. In contrast, muscular hypertrophy of the chest and shoulders, high levels of hand-eye coordination, and upper body strength are less relevant for soccer performance compared to sports like American football or baseball that might put more emphasis on these areas.
To gather data on the heights of male semiprofessional soccer players that is characteristic of this group, a researcher could use a stratified random sample from various soccer leagues to ensure a diverse and representative sample. The data from Table 1.15 of the heights of 100 male semiprofessional soccer players could be used for analysis, with the understanding that while height can influence certain aspects of play, it is muscular endurance in the lower body that is commonly seen as the most important physical attribute for soccer players.