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Statistics Chap1

TermDefinition
When stock prices are in decline bear market
When stock prices are on the rise bull market
A security that represents the ownership of a fraction of a corporation stock
A numerical measurement describing some characteristic of a sample statistic
A numerical measurement describing some characteristic of a population parameter
When the data values are quantitative, and the number values are finite or countable discrete
Infinitely many possible quantitative values, where the collection of values is not countable continuous
Characterized by data that consist of names, labels or categories only nominal
Data can be arranged in some order, but differences between data values can’t be determined, or are meaningless. (can contain qualitative and quantitative data. Doesn’t have to have numbers) ordinal
Data can be arranged in order, and differences between data values can be found and are meaningful. Data at this level do not have a natural zero starting point at which none of the quantity is present interval
Data that can be arranged in order, differences can be found and are meaningful, and there is a natural zero starting point ratio
observes and measures specific characteristics, but we don’t attempt to modify the subjects being studied observational study
We apply some treatment and then proceed to observe its effects on the subjects experiment
Each individual member has the same chance of being chosen random sample
Subdivide the population into at least two different subgroups (or strata) so that subjects within the same subgroup share the same characteristics (such as gender or age bracket). Then draw a sample from those subgroups stratified sample
Select some starting point, then select every kth (such as every 50th) element in the population systematic sample
Divide the population into sections (clusters), then randomly select some of those clusters. Then choose ALL members from the chosen clusters cluster sample
Use results that are easy to get. (politician just went and asked his own neighbors) convenience sample
Type of observational study in which data are measured at one point in time. cross-sectional
Go back in time to collect data over some past period. retrospective
Go forward in time and observe groups sharing common factors, such as smokers and nonsmokers. prospective
The collection of data from every member of a population census
part of a group was surveyed sample
the whole group was surveyed population
Popular Math sets

 



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