What is the primary characteristic of the Census Method? Investigates the entire population Utilizes non-probability sampling Focuses on a small group Random selection What does feasibility in a research problem refer to? The researcher's interest and enthusiasm The financial considerations All of the above The time requirement for the project What is the primary purpose of executing the project in research? To formulate the research problem To analyze the data To collect primary data To ensure adequate and dependable data collection 3
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A common problem encountered by many classical music radio stations is that their listeners belong to an increasingly narrow range of ages in the population. Tracy Zenner, a manager at a classical music radio station, believed that listeners would be more diverse if the playlist offered by the station was changed. Information on the ages of listeners before and after the new playlist was adopted is summarized below: Sample 1 (Before the Adoption of the Playlist): - Sample Size: 56 - Sample Variance: 56.25 Sample 2 (After the Adoption of the Playlist): - Sample Size: 76 - Sample Variance: 76.56 Test at the 0.05 level of significance whether the data provide sufficient evidence to conclude that the new playlist has expanded the range of listener ages. Note the alternative hypothesis variance < population variance. The test statistic equation is: (Write Your Answer precise to three decimal places: 1.437, 0.821) The rejection region is given by: (Write Your Answer precise to three decimal places: 1.437, 0.821) The outcome from the test can be stated as follows: There is significant evidence to indicate that the range of listener ages has expanded with the adoption of the playlist. (Write "is" or "is not" - without the quotation marks.)
David N.
Question 1 (a) How would you ensure that the sample studied in a survey is selected in such a way that it is representative of the population and it mirrors the population from which it is selected? (b) One of the advantages of a sample surveys is of reduced cost, which means that the expense of obtaining information from a sample is lower than the expense of obtaining information from a complete enumeration or a census. Give three reasons why you would obtain information from a sample with reduced cost. (c) Give a clear explanation why one cannot use information collected from a sample selected by non-probability sampling for making generalization and conclusion about the underlying population. (c) When both time and money are limited, convenience sampling is commonly used. Explain this statement. Question 2 (a) i) Why is it necessary that researchers and experts discuss and decide on the required information during the design, planning and execution of a survey? ii) One of the principal steps in a sample survey is to clearly define objectives of the study because if the objectives are not clearly defined there is a possibility of under coverage and over coverage. What do under coverage and over coverage mean in this context of conducting a study or a survey? (c) How would poorly designed and untested systems, that entail rules for editing and coding, data entry form and data cleaning and verification rules, cause non-sampling error at the implementation stage of a survey? (b) Explain why you would prefer close-ended questions from open-ended questions, when you design a questionnaire that will be used to collect data.
Sri K.
is the entire group of individuals a researcher is interested in studying; while a is the smaller group that the researcher actually conducts the research study on population; cohort population; sample cohort; population sample; population
Ahmet Y.
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