81.   In addition to sampling error, the practical difficulties of conducting any survey of public opinion may introduce other sources of error into the poll.

82.   In addition to sampling error, the practical difficulties of conducting any survey of voter opinion on Election Day may introduce other sources of error into the poll.

83.   In addition to sampling error, the practical difficulties of conducting any survey of public opinion may introduce other sources of error.

84.   In late April, the effort was bolstered again when a Republican pollster conducted a survey that made some Republicans cringe.

85.   In March, Auto Pacific, an automotive product and marketing consulting concern, conducted surveys of SUV owners who had bought their cars since September.

86.   Indeed, while Britons have been talking, conducting opinion surveys and generally postponing a final decision, the euro has already been creeping up on them.

87.   Instead, Sapient frequently conducts online surveys of its customers, compiling answers into closely targeted consumer research reports for drug companies and device makers.

88.   James Boswell, president of Boswell Surveying in Harrington Park, N.J., said he often conducted land surveys for clients purchasing property in rural areas.

89.   John Burnham, a senior manager at Veres, which conducts surveys for nonprofit associations, said the reason was economic.

90.   Johns Hopkins Hospital in Baltimore is one of many institutions that prepare for inspections by conducting mock surveys.