A boil water notice has been lifted for northwest Harris County after a sampling error spared E. coli concerns. The video above is from a previous report. On Tuesday ...

NEWS APP FOR WEATHER ALERTS ANYTIME. WATER QUALITY IN THE CITY OF RIVIERA BEACH IS TAKING CENTER STAGE AGAIN TONIGHT, BUT THIS TIME IT’S BECAUSE A REPORT SUGGESTS THE WATER MAY HAVE ALWAYS BEEN SAFE ...

Systematic sampling is straightforward and low risk, offering better control. However, it may introduce sampling errors and ...

A behind-the-scenes blog about research methods at Pew Research Center. For our latest findings, visit pewresearch.org. Academic survey researchers tend to differ ...