Exam 6: Qualitative and Quantitative Sampling

Which random sampling method is best when the population has several groups and a researcher wants to ensure that each group is in the sample? Give an example.

Refer to the following paragraph to answer the questions below. Professor Alco Drunkman studied class level and drinking behavior at Wild State University in Boozville, Texas. Every student is required to live in one of six twenty-story-tall dormitories, and has a single room. All dormitory room phone numbers began with the prefix 747 or 757 (e.g., phone numbers are 747-0001 to 757-9999). He used the student telephone directory, and after a random start selected every 15th student. He then mailed a questionnaire to the 1,000 students selected and had two follow-up postcard reminders. A total of 900 students returned questionnaires. Later, he asked the university registrar whether any students were omitted from the directory. -Drunkman decided to conduct his study using a telephone interview instead using a mailed questionnaire. Which is the most accurate way to sample?

Hubert Humbort wants to draw a sample of people in Michigan who own an authentic, imported espresso coffee maker. There is no list of the people, and there is no reason to believe that they know each other. What type of sampling should Hubert use?

Talk about: -nonrandom sample

Talk about: -systematic sampling

Talk about: -purposive sampling

Refer to the following paragraph to answer the questions below. Professor Alco Drunkman studied class level and drinking behavior at Wild State University in Boozville, Texas. Every student is required to live in one of six twenty-story-tall dormitories, and has a single room. All dormitory room phone numbers began with the prefix 747 or 757 (e.g., phone numbers are 747-0001 to 757-9999). He used the student telephone directory, and after a random start selected every 15th student. He then mailed a questionnaire to the 1,000 students selected and had two follow-up postcard reminders. A total of 900 students returned questionnaires. Later, he asked the university registrar whether any students were omitted from the directory. -The registrar's office stated that 3,000 currently-enrolled student names were omitted from the directory, but everyone in the directory was still enrolled. With this revised estimate of the population and final number of students on which he has data, what is Drunkman's actual sampling ratio?

Refer to the following paragraph to answer the questions below. The Young Children's Charity would like to provide an accurate estimate of how much it costs to raise a child between the ages of 2 and 12 each year for its fundraising campaign. They contracted with you to find out how much households spent on raising a child in 2006 for clothing, toys/recreation, education, baby sitting, and a percentage of the expenses for family food, utilities (electricity and gas), transportation, and rent or house payments. They gave you a list 4 million residential telephone customers in the area they will operate the campaign. You sampled every 4,000th address on the list. The Charity will have a professional survey company contact each sampled household by telephone and ask whether or not there is a child between 2 and 12 years old living in the household. If there is, their interviewers will ask other questions and record the total amount spent raising a child in the past two months. They will multiply this amount by 6 to get an annual cost. -What is his sampling ratio?

Talk about: -sampling distribution

Talk about: -stratified sampling

Talk about: -hidden populations

Refer to the following paragraph to answer the questions below. Dr. Martinez draws a systematic sample of 350 churches from all churches and religious institutions in the three Pacific coast states of the continental U.S. and British Columbia. His sampling frame has 35,000 institutions. -What is the sampling interval?

Refer to the following paragraph to answer the questions below. Dr. Martinez draws a systematic sample of 350 churches from all churches and religious institutions in the three Pacific coast states of the continental U.S. and British Columbia. His sampling frame has 35,000 institutions. -What is the sampling ratio?

Talk about: -snowball sampling

Talk about: -statistic

John Johnson used nonrandom sampling in his study of successful scientists. He knew most got excellent grades in high school and college, excelled in mathematics, and had a strong interest in science from a young age. For his study, he was interested in sampling those who were successful as adult scientists, but did poorly in high school, did average or worse in math classes, and showed little interest in science until they reached college or later in life. What type of sampling was he using?

Talk about: -sampling error

Talk about: -quota sampling

Talk about: -parameter

Talk about: -cluster sampling