Identify the type of sampling used: (systematic, cluster, stratified, simple random, convenience) To estimate the percentage of defects in a manufacturing batch, a quality-control... Identify the type of sampling used: (systematic, cluster, stratified, simple random, convenience) To estimate the percentage of defects in a manufacturing batch, a quality-control manager at Intel selects every 8th chip that comes off the assembly line starting with the 3rd until she obtains a sample of 140 chips. To determine the prevalence of human growth hormone (HGH) use among high school varsity baseball players, the State Athletic Commission randomly selects 50 high schools. All members of the selected high schools' varsity baseball teams are tested for HGH. To determine customer opinion of its boarding policy, SouthWest Airlines randomly selects 60 flights during a certain week and surveys all passengers on the flights. A member of Congress wishes to determine her constituency's opinion regarding estate taxes. She divides her constituency into three income classes: low-income, middle, and upper-income households. She then takes a simple random sample from each income class. In an effort to identify whether an advertising campaign has been effective, a marketing firm conducts a nationwide poll by randomly selecting individuals from a list of known users of the product. A radio station asks its listeners to call in their opinion regarding the use of U.S. forces in peacekeeping missions. A farmer divides his orchard into 50 subsections, randomly selects 4, and samples all the trees within the 4 subsections to approximate the yield of his orchard. A college official divides the student population into five classes: freshman, sophomore, junior, senior, and graduate student. The official takes a simple random sample from each class and asks the members' opinion regarding student services. A survey regarding download time on a certain Website is administered on the Internet by a market research firm to anyone who would like to take it. The presider of a guest-lecture series at a university stands outside the auditorium before a lecture begins and hands every fifth person who arrives, beginning with the third, a speaker evaluation survey to be completed and returned at the end of the program. To determine his DSL Internet connection speed, Shawn divides up the day into four parts: morning, midday, evening, and late night. He then measures his Internet connection speed at 5 randomly selected times during each part of the day. 24 Hour Fitness wants to administer a satisfaction survey to its current members. Using its membership roster, the club randomly selects 40 club members and asks them about their level of satisfaction with the club. Read more