A true population proportion represents the fraction of people in a certain population who have a given characteristic, such as the proportion of non-traditional students at a university. However, it is often impractical to poll the entire population of interest, so statisticians typically poll a s...
We evaluated two methods using drug utilisation information to estimate the population size: a drug-use-based extrapolation of a known part of the population and a capture-recapture estimation without any prior knowledge of the population. METHODS: Using pharmacy-dispensing data of three towns with ...
Some people suggest that a country should try to produce all the food for its population and import as little food as possible. To what extent do you agree or disagree? Give reasons for your answer and include any relevant examples from your own knowledge or experience. Write at least 250 ...
Get a random sample of the population. If your sample is not random, estimates of the proportion (and other quantities) may be biased. For example, if you want to estimate the proportion of boys in an elementary school, you could assign a number to each student, then randomly pick a sam...
A statistic can bemore than one type. For example, the samplestandard deviationcan be used as a descriptive statistic to describe thestandard deviationof a sample. It can be used as an estimator: To estimate the population standard deviation. And it can be used to test a theory (ahypothesis...
Which study shows the greater confidence level that the results were not due to chance? Explain your answer. A random sample of 200 registered voters revealed that 54% of them voted in the last election. Construct the 99% confidence interval to estimate the true proportion of voter ...
Known Confidence Interval and Width (unknownpopulation standard deviation). Known Confidence Interval and Width (knownpopulation standard deviation). Find a sample size to estimate a population mean Use Excel to find a sample size. To learn more watch the video below or keep reading. ...
This step asks you to estimate how much the responses you receive will vary from each other and from the mean number. A low standard deviation means that all the values will be clustered around the mean number, whereas a high standard deviation means they are spread out across a much wider...
A confidence interval, in statistics, refers to the probability that apopulationparameter will fall between a set of values for a certain proportion of times. Analysts often use confidence intervals that contain either 95% or 99% of expected observations. Thus, if a point estimate is generated ...
When a sample survey is used, there is a chance that the sample estimates may differ from the actual population values. According to the BLS, there is a 90% chance that the monthly unemployment estimate change from the sample is within +/- 130,000 of the figure obtainable from a total ...