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Exam 1 study sheet - Statistics the science comprising...

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Statistics – the science comprising rules and procedures for collecting, describing, analyzing, and interpreting numerical data Descriptive statistics – collect and describe data Inferential statistics – analyze the data and make decisions or estimates based on information obtained from the data Population – the set of all possible measurements that is of interest Sample – the portion of the population from which information is gathered Simple random sample – items in a sample are usually selected at random from the items that comprise the population Census – when a sample consists of the entire population Parameter – the first proportion, the proportion of defective components in the population Statistic – the second proportion, the proportion of defective components in the sample Discrete – the primary difference is that the values in the first data set consist of counting numbers, or integers Continuous – any value over some particular range is possible. There are no gaps in possible values for continuous data Nominal data – are really not numerical at all but are merely labels or assigned values Ordinal data – can be arranged in order such as worst to best Interval data – it is meaningful to add and average such data. (Temperature) Ratio data – differ from interval data in that there is a definite zero point that indicates that nothing exists for the variable being measured (If the value can be twice the strength it is ratio if it is not it is interval)
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