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A marketing research firm selects a random sample of adults and asks them a list of questions regarding their beverage preferences. What type of data collection is involved here?
Which of the following must be avoided in designing a survey?
Which method of data collection is involved when a researcher counts and records the number of students wearing backpacks on campus in a given day?
A researcher conducts a study where she divides subjects into two groups, gives each group a certain treatment, and records their responses. What type of data collection is being used here?
Which of the following data collection methods is not observational?
When the population is divided into mutually exclusive sets, and then a simple random sample is drawn from each set, this is called:
A pharmaceutical company interested in measuring how often physicians prescribe a certain drug has selected a simple random sample from each of two groups: M.D. (Medical Doctors) and D.O. (Osteopaths). What is this type of sampling called?
When every possible sample with the same number of observations is equally likely to be chosen, the result is called a:
Which of the following causes sampling error?
The mean age of all students at York University is 24 years. The mean age of a random sample of 100 students selected from this university is found to be 24.6 years. The difference 24.6 – 24 = 0.6 is called the:
To give away a door prize, the host of a dinner party put each person’s name into a hat, mixed them up, and selected one name. What sampling method was used?
Which of the following situations lends itself to cluster samples?
Which of the following describes selection bias?