Quantitative Research Techniques & Statistics Peregrine Questions and Verified Answers| 100% Correct| Grade A+

A company developed a smartphone whose average lifetime is unknown. In order to estimate the average, 200 smartphones are randomly selected from a large production line and tested; their average is found to be 5 years. The 200 smartphones represent: - a sample Significance level - Measures the reliability of a statistical inference inferential statistics - Process of using sample statistics (mathematics) to draw conclusions about population parameters mutually exclusive - Events that cannot occur at the same time. sampling error - the difference between the results of random samples taken at the same time non-sampling error - occurs when the sample data are incorrectly collected, recorded, or analyzed. Three types of errors: data acquisition errors, non-response errors (or bias), selection bias Design of a good survey components - short survey, short/simple questions, start with demographic questions, ues dichtomous (yes-no) and multiple choice Direct observation - example: counts backpacks on campus for a day stratified random sample - a sample from selected subgroups of the target population in which everyone in those subgroups has an equal chance of being included in the research example: The manager of a customer service division wants to know if the customers in the past 12 months are satisfied with their purchase of CD's. There are four types of CD's. Joint Probability - the probability of the intersection of two events