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When is probability theory used in statistics?
All the time. Statistic is based on the application of probability theory!
Roles of a inferential statistics in statistics?
Statistics is a general field of numeric quantities and what they represent. For example, a statistic may be inferential or descriptive. Inferential statistics are special kinds of statistics that use sampling distributions to make inferences from a sample to a population of interest (hopefully that the sample represents). The inferences are more or less valid based on how well one meets the assumptions of a statistical method/model and how robust a statistical method is with respect to violations of an assumption.
Are inferential statistics different from descriptive statistics?
Yes. Descriptive statistics are methods of organizing, summarizing, and presenting data in an informative way. Inferential Statistics (also called statistical inference) the methods used to estimate a property of a population on the basis of a sample.
Would it be descriptive or inferential statistics to say that in the year 2010 that 148 million Americans will be enrolled in an HMO?
The question was posted in 2013 and so it is quite possible that the actual numbers for 2010 were available from some study. If that was the case, then the statement would be descriptive. However, it could be based on the number of Americans employed in HMOs in an earlier year together with projections based on other measures. In that case, it would be inferential.
What are the benefit of inferential statistics in Psychology?
Populations, parameters, and samples in inferential statistics. Inferential statistics lets you draw conclusions about populations using small samples. Consequently, inferential statistics provide enormous benefits because typically you can not measure and entirepopulation.Roll no: 18-237
