Chapter 1: Q11. (page 49)
Give an example of unethical statistical practice.
Short Answer
A company intentionally discarding certain information from its sales data in a specific year can be regarded as an unethical statistical practice.
Chapter 1: Q11. (page 49)
Give an example of unethical statistical practice.
A company intentionally discarding certain information from its sales data in a specific year can be regarded as an unethical statistical practice.
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Get started for freeThe economic return to earning an MBA. What are the economic rewards (e.g., higher salary) to obtaining an MBA degree? This was the question of interest in an article published in the International Economic Review (August 2008). The researchers made inferences based on wage data collected for a sample of 3,244 individuals who sat for the Graduate Management Admissions Test (GMAT). (The GMAT exam is required for entrance into most MBA programs.) The following sampling scheme was employed. All those who took the GMAT exam in any of four selected time periods were mailed a questionnaire. Those who responded to the questionnaire were then sent three follow-up surveys (one survey every 3 months). The final sample of 3,244 represents only those individuals who responded to all four surveys. (For example, about 5,600 took the GMAT in one time period; of these, only about 800 responded to all four surveys.)
A. For this study, describe the population of interest.
b. What method was used to collect the sample data?
c. Do you think the final sample is representative of the population? Why or why not? Comment on potential biases in the sample.
Explain the difference between quantitative and qualitative data?
Customer orders at a department store. A department store receives customer orders through its call center and website. These orders, as well as any special orders received in the stores are forwarded to a distribution center where workers pull the items on the orders from inventory, pack them, and prepare the necessary paperwork for the shipping company that will pick up the packages and deliver them to the customers. In order to monitor the subprocess of pulling the items from inventory, one order is checked every 15 minutes to determine whether the worker has pulled the correct item.
a. Identify the process of interest.
b. Identify the variable of interest. Is it quantitative or qualitative?
c. Describe the sample.
d. Describe the inference of interest.
e. How likely is the sample to be representative?
College application data. Colleges and universities are requiring an increasing amount of information about applicants before making acceptance and financial aid decisions. Classify each of the following types of data required on a college application as quantitative or qualitative.
a. High school GPA
b. Honors, awards
c. Applicant's score on the SAT or ACT
d. Gender of applicant
e. Parents’ income
f. Age of applicant
List the three major methods of collecting data and explain their differences.
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