Data Collection And Sampling

Determine whether the description corresponds to an observational study or an experiment. Research is conducted to determine if there is a relation between stomach cancer and alcohol consumption.

Determine whether the given description corresponds to an observational study or an experiment. In a study of 357 boys with a particular​ disease, the subjects were given certain drugs to determine if the drugs have an effect on the disease.

Determine whether the description below corresponds to an observational study or an experiment. In a study sponsored by a​ company, 13,125 people were asked what contributes most to their anxiety, and 47% of the respondents said that it was their health.

Identify the type of sampling used​ (random, systematic,​ convenience, stratified, or cluster​ sampling) in the situation described below. A man is selected by a marketing company to participate in a paid focus group. The company says that the man was selected because everyone in six randomly selected towns was being selected.

Identify the type of sampling used​ (random, systematic,​ convenience, stratified, or cluster​ sampling) in the situation described below. In a poll conducted by a certain research​ center, 920 adults were called after their telephone numbers were randomly generated by a​ computer, and 68% were able to correctly identify the attorney general.

Identify which type of sampling is​ used: random,​ systematic, convenience,​ stratified, or cluster. A magazine asks its readers to call in their opinion regarding the quality of the articles.

Identify the type of sampling​ used: random,​ systematic, convenience,​ stratified, or cluster. To estimate the percentage of defects in a recent manufacturing​ batch, a quality control manager at Ford selects every 14th truck that comes off the assembly line starting with the ninth until she obtains a sample of 60 trucks.

Identify the type of sampling used​ (random, systematic,​ convenience, stratified, or cluster​ sampling) in the situation described below. A man experienced a tax audit. The tax department claimed that the man was audited because he was randomly selected from all men in his age group.

Identify which type of sampling is​ used: random,​ systematic, convenience,​ stratified, or cluster. To determine customer opinion of their safety features​, Daimler - Chrysler randomly selects 50 service centers during a certain week and surveys all customers visiting the service centers.

Identify the type of sampling used​ (random, systematic,​ convenience, stratified, or cluster​ sampling) in the situation described below. A researcher selects every 648th social security number and surveys the corresponding person.

Which sampling method divides the population up into​ sections, randomly selects some of those​ sections, then chooses all the members from the selected sections to​ study?

Which sampling method subdivides the population into categories sharing similar characteristics and then selects a sample from each​ subdivision?

A study is conducted to measure​ children's growth rates without any treatment applied to the children. What best classifies this​ study?