Final answer:
A public group, as per the question, can be viewed as any group with an interest or impact on an organization's objective achievement, aligning with the broad definition of an interest group. Interest groups seek to influence public policy in favor of either public or private goods, and they play a significant role in representing these interests to decision-makers and the public.
Step-by-step explanation:
Public interest groups and private interest groups differ in the scope and type of benefits they seek. A public group is indeed any group that has an actual or potential impact on an organization's ability to achieve its objectives. This notion fits the definition of an interest group, which is any association of individuals or organizations that attempts to influence government decision-making and/or the making of public policy.
Interest groups, whether advocating for public or private goods, aim to shape public policy in a way that aligns with their goals. Public interest groups strive for the provision of collective goods like public safety, environmental protection, and public education—benefits that help most or all citizens. Conversely, private interest groups often seek particularized benefits, such as tax exemptions or favorable legislation, which are more likely to accrue to specific, sometimes wealthier, segments of society.
Interest groups influence public policy by framing issue debates, using media tactics, and citing public opinion polls, all in hopes of swaying decision-makers and public sentiment. For example, during discussions about global warming and government regulations on pollution, groups like the Environmental Defense Fund, Greenpeace, and the Sierra Club used poll data to show public support for their positions.