Sampled population - Study guides, Class notes & Summaries

Suppose a political party wants to estimate how favorable a certain candidate is to state voters. To do so, a sample of 400 registered voters were selected. Suppose 160 found the candidate "favorable". An estimate of the proportion of the population of registered voters is 160/400=40%. This is an example of what? Example of finite sample Suppose a new tire is being developed and the manufacturer wants to know the useful life of the new type of tire. A sample of 120 tires were tested an...

Stats Review Test Questions 2024. When determining the sample size for a proportion for a given level of confidence and sampling error, the closer to 0.50 that π is estimated to be, the sample size required ________. - CORRECT ANSWER larger The width of a confidence interval estimate for a proportion will be - CORRECT ANSWER narrower for 90% confidence than for 95% confidence. A 99% confidence interval estimate can be interpreted to mean that - CORRECT ANSWER both of the above If ...

POSC 225 Final Exam NIGHTIGALE COLLEGE Questions with complete solution POSC 225 Final Exam (JMU) Public Good - correct answer Something that can be reproduced easily and costs very little money, if any at all Example: Clean Air Private Good - correct answer Something that cannot be produced easily and if usually very expensive Example: Smartphone News Media Bias - correct answer Representation of info that reflects emphasis on an underlying value New Media Accuracy - correct...

The lengths of stay for six patients were 0, 0, 1, 2, 2, and 16 days. Which is (are) the best measure(s) to summarize these data? A) Mean B) Median C) Median and SD D) Mean and SD E) Median and Range E) Median and Range An epidemiologist attempts to predict the weight of an elderly person from demispan. She randomly chooses 70 elderly subjects in a particular geographic area and records their weight and demispan measurements in the form of (x i , y i ) for i = 1...70. Given that t...

CPH Exam Latest Update with Verified Solutions The epidemiologic triangle (triad) describes the occurrence of disease as an interaction between what three factors? Host, agent and environment Which of the following estimates of an odds ratio most strongly suggests a computational error? 1) 7.8 2) 1.2 3) -0.9 4) 20.9 -0.9 An odds ratio of -0.9 most strongly indicates a computational error because an odds ratio is calculated using probabilities, which cannot be negative. An odds ratio is the...

Suppose that a random variable x has a uniform distribution with c = 2 and d =8. Find P(3 <= x <= 5) correct answers .333 Find the area under the normal curve when P(Z > -2) correct answers .9772 Find the area under the normal curve between P(1 < z <2) correct answers .1359 In a manufacturing process, we are interested in measuring the average length of a certain type of bolt. Past data indicate that the standard deviation is .25 inches. How many manufactured bolts should...

CPH Exam Questions & Answers 2023/2024 The epidemiologic triangle (triad) describes the occurrence of disease as an interaction between what 3 factors? a) person, place, and time b) host, agent, and environment c) person, environment, and immunity d) host, agent, and exposure - ANSWER-b) host, agent, and environment Which of the following estimates of an odds ratio most strongly suggests a computational error? a) 7.8 b) 1.2 c) -0.9 d) 20.9 - ANSWER-c) -0.9 The sensitivity of ...

BUS 240 TEST 4 | QUESTIONS WITH VERIFIED ANSWERS A national manufacturer of ball bearings is experimenting with two different processes for producing precision ball bearings. It is important that the diameters be as close as possible to an industry standard. The output from each process is sampled and the average error from the industry standard is measured in millimeters. The results are shown on the table. The researcher is interested in determining whether there is evidence that the two pr...

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Parameter - ANSWERA numerical characteristic of a population, such as a population mean µ, a population standard deviation σ, a population proportion p, and so on. Target population - ANSWERThe population for which statistical inferences such as point estimates are made. It is important for the target population to correspond as closely as possible to the sampled population. Sampled population - ANSWERThe population from which the sample is taken. Sampling distribution - ANSWERA proba...