Final answer:
Gregory's study group's goal to get fit by playing soccer three times a week lacks measurability. A measurable goal could include metrics like average goals scored or injury reduction, backed by a significant sample size for data reliability.
Step-by-step explanation:
The goal set by Gregory's study group to get fit by playing soccer three times a week does not meet one specific criterion typically associated with setting goals, although it does seem to address others. One key aspect of effective goal setting is to make the goal measurable, so progress can be tracked and the goal can be objectively assessed for achievement. While their goal is specific (playing soccer to get fit), actionable (kicking the ball around), and time-bound (three times a week), it isn't inherently measurable. They do not have a specific fitness metric to measure their progress against, such as cardiovascular endurance, weight loss, strength gains, or overall soccer skill improvement.
Furthermore, when analyzing certain variables that can affect playing soccer, a player, gravity, air, and friction can commonly exert forces on a soccer ball being kicked. A measurable goal in this context could include quantifiable aspects of soccer playing abilities, like increasing average goals scored per game or decreasing the number of injuries during play. It's important to note that a large enough sample size, like more than 15 students, would be necessary to acquire reliable data on any correlations or findings.