Lesson_06_sol_ci_one - Confidence Intervals Proportion and...

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1 Confidence Intervals – Proportion and One Mean 1 The term sampling frame refers to the group that actually had a chance to get into the sample. Ideally, this is the same as the population of interest, but sometimes it isn’t. In the following situation, describe the population, the sampling frame, the sample, the parameter of interest, and the statistic. A Gallup Poll is done using random digit dialing to reach individuals in households with land-line telephones. The purpose is to estimate the proportion of U.S. adults who favor stronger gun control laws. One-thousand persons are sampled, and 63% favor stronger gun control. a. Population = all U.S. adults (note that this is becoming a potential problem as many adults - primarily younger adults - no longer have land line phones but instead use cell phones. b. Sampling frame = adults in the households with land-line telephones c. Parameter = proportion of U.S. adults favoring stronger gun control d. Sample = the 1,000 surveyed e. Statistic =63%, the sample percent 2 From the Data Sets folder open the Class Survey data. a. Since this is a class survey of stat200 students at PSU what do you believe is the best population that this data represents? Answers vary, but some examples are “All PSU undergraduate students at University Park”; “All PSU undergraduate students at Penn State”; “All PSU Stat200 Students”. The population would NOT be all stat 200 students in our section(s) since this survey would not be a sample but instead the population as all students took the survey b. How is the class survey representative of that population?
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This note was uploaded on 10/08/2010 for the course STAT 200 taught by Professor Barroso,joaor during the Fall '08 term at Pennsylvania State University, University Park.

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Lesson_06_sol_ci_one - Confidence Intervals Proportion and...

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