Exam 4: Gathering Data

A carload of palletized aluminum castings has arrived at Mansfield Motor Manufacturers. The car contains 1,000 pallets of 100 castings each. Mario Munoz, manager of Quality Assurance, directs the receiving crew to deliver the 127th and 869th pallets to his crew for 100% inspection. Mario randomly selected 127 and 869 from a table of random numbers. Mario's sample of 200 castings is a ___.

Alice Zhong is the VP of operations at Pearl Financial Services. She wants to measure customer satisfaction after a new website and other changes were introduced a few months ago. 28% of clients are from the healthcare industry, 35% are manufacturing companies, 27% are financial firms, and 7% are construction companies. For this purpose, she gets random five-digits numbers from the website random.org (which offers true random numbers on the Internet). Then she uses these numbers to select 140 random clients from the healthcare sector, 175 from the manufacturing sector, 135 from the manufacturing sector, and 35 from the construction sector. This is an example of ___.

Systematic sampling is a type of random sampling technique.

Albert Abbasi, VP of Operations at Ingleside International Bank, is evaluating the service level provided to walk-in customers. Accordingly, he plans a sample of waiting times for walk-in customers. Albert randomly selects 4 as a starting point and instructs his staff to record the waiting times for the 4th walk-in customer and every 10th customer thereafter (4, 14, 24, etc.). Albert's sample is a ___.

The directory or map from which a sample is taken is called the census.

Interviewing all members of the population is known as

Financial analyst Larry Potts needs a sample of 100 securities listed on the New York Stock Exchange. In the current issue of the Wall Street Journal, 2,531 securities are listed in the "New York Exchange Composite Transactions," an alphabetical listing of all securities traded on the previous business day. Larry uses a table of random numbers to select 100 numbers between 1 and 2,531. His sample is a ___.

If every unit of the population has the same probability of being selected to the sample, then the researcher is conducting random sampling.

Catherine Chao, Director of Marketing Research, needs a sample of households to participate in the testing of a new toothpaste package. She chooses thirty-six of her closest friends. Catherine's sample is a ___.

If a researcher selects every k^th item from a population of N items, then she is likely conducting a systematic random sampling.

The process of drawing a sample for a given a population is known as

With cluster sampling, there is homogeneity within a subgroup or stratum.

Alice Zhong is the VP of operations at Pearl Financial Services. She wants to measure customer satisfaction after a new website and other changes were introduced a few months ago. For this purpose, she instructs her staff to prepare a questionnaire and send it to the clients that access the company's website during from 8 a.m. to 9 a.m. for the next four weeks. This is an example of ___.

Paige DeMarco is the Vice President for University Advancement at State University. She is responsible for the capital campaign to raise money for the new student services building. Paige plans to target alumni and acquires her sampling frame from the State University Office of Alumni Relations. She intends to contact these individuals regarding possible donations. She randomly selects the sixth name as a starting point and then selects every 100th subsequent name (106, 206, 306, etc.). Her sample is a ___.

If every unit of the population has the same probability of being selected to the sample, then the researcher is probably conducting random sampling.

Cluster (or area) sampling is a type of random sampling technique.

Saving time and money are reasons to take a sample rather than do a census.

Paige DeMarco is the Vice President for University Advancement at State University. She is responsible for the capital campaign to raise money for the new student services building. Paige selects the first 100 alumni listed on a web-based social networking site for State University. She intends to contact these individuals regarding possible donations. Her sample is a ___.

Financial analyst Larry Potts needs a sample of 100 securities listed on either the New York Stock Exchange (NYSE) or the American Stock Exchange (AMEX). According to the Wall Street Journal's "Stock Market Data Bank," 2,531 NYSE securities and AMEX 746 securities were traded on the previous business day. Larry directs his staff to randomly select 77 NYSE and 23 AMEX securities. His sample is a ___.

A nonrandom sampling technique that is similar to stratified random sampling is called quota sampling.