7年级调查偏差与说法评价练习：20份调查回答

调查说法与抽样限制：花园阅读

Invented garden survey: 12 volunteers answered after a demonstration; 9 preferred the new plan. Only attendees who stayed until the end could respond. The organizer writes, “Everyone in the community prefers our plan.” No non-attendee responses were collected.

调查说法与抽样限制：图书馆阅读

Invented library survey: 16 volunteers answered after a demonstration; 13 preferred the new plan. Only attendees who stayed until the end could respond. The organizer writes, “Everyone in the community prefers our plan.” No non-attendee responses were collected.

调查说法与抽样限制：工作坊阅读

Invented workshop survey: 24 volunteers answered after a demonstration; 21 preferred the new plan. Only attendees who stayed until the end could respond. The organizer writes, “Everyone in the community prefers our plan.” No non-attendee responses were collected.

项目调查

虚构的练习数据或情境，并非真实研究报告。

A fictional class of 24 students answered a project survey. Eighteen selected a garden and six selected a mural. The form offered only those two choices and did not ask students why they chose them. No students from other classes took part. A poster writer used the results to claim, “Every student in our town wants a garden.” The class had not asked about cost, care duties or whether students would participate. The survey measures preference between two offered options in one class; it does not measure attendance or town-wide demand.