Using this method, information is obtained through oral exchange of questions and answers. a. Interview C. experiment b. Questionnaire d. document Using this method, information is acquired and recorded through direct observation. a. Experiment c. observation b. Interview d. document It occurs when the listing of subjects in the population is inadequate such that a group is unintentionally excluded in the selection of samples. a. Coverage error C. non-response error b. Sampling error d. measurement error In this method, a certain number of sample elements are pre-determined based on the judgment of the researcher. a. Purposive sampling c. quota sampling b. Convenience sampling d. cluster sampling It is the discretion of the researcher on which member of the population satisfies the criteria. a. Purposive sampling c. quota sampling b. Convenience sampling d. cluster sampling Is the complete set of all possible numerical and quantitative responses. a. Population c. sample b. Sample size d. slovens Is the number of elements in the sample set. a. Population c. sample b. Sample size d. slovens