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# Statistics Exam 1

### Exam 1

TermDefinition
Nominal Level Data consists only of names/ labels/categories. Data cannot be arranged in some inherent order.
Ordinal Level Data can be arranged in some inherent (built in) order, but differences between data either cannot be obtained or are meaningless.
Interval Level Data can be arranged in order and meaningful differences can be found between data, but there is no inherent starting point (like 0).
Ratio level: Data can be arranged in an order and there are differences and there is an inherent starting point.
Cluster Sampling: 1st divide the population into groups. An entire group is either in the sample or an entire group is not represented in the sample.
Stratefied Sampling First divide the population into two or more groups. Then select some members from each group.
Systematic Sampling A starting point is chosen and every k'th number of the population is selected.
Convenience Sampling Using results that are readily available.
Random Sampling Members of a population are selected in such a way that each member has an equal chance of being selected.
*Know the difference between a Distribution and a Histogram* *Know the difference between a distribution and a histogram*
(smallest data+largest data value)/2 How to find midrange
Variance The square of the standard deviation
Created by: sham13