Paper 7 October/November 2004 MATHEMATICH (9709/7) A Levels
لطفا برای اطمینان از عملکرد و تجربه بهتر از مرورگرهای مدرن و به روز مانند کروم یا فایرفاکس استفاده کنید.

The editor of a magazine wishes to obtain the views of a random sample of readers about the future of the magazine.
a) A sub-editor proposes that they include in one issue of the magazine a questionnaire for readers to complete and return. Give two reasons why the readers who return the questionnaire would not form a random sample.
The editor decides to use a table of random numbers to select a random sample of 50 readers from the 7302 regular readers.…