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STATS: 1.1 - Sampling
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Terms in this set (14)
Statistics
Study of procedures for collecting, describing, drawing conclusions
Population
Entire collection
Sample
Subset of population
Simple random sample (SRS)
Chosen by a method where each collection of n items is equally likely to make up the sample
When are samples of convenience are acceptable?
When SRS methods are time consuming/not worth it (pile of bricks)
Stratified sampling
Population is divided into groups, choose 1 from each group
Cluster sampling
Entire groups are drawn from population
Systematic Sampling
Items ordered, every k^th item chosen
Voluntary sampling
People volunteer to be a sample, strong opinions, negative ones more likely
Statistic
Number that describes sample
Parameter
Number hat describes population
STATISTIC OR PARAMETER? The average number of employees in a certain company is 35 years
Parameter
STATISTIC OR PARAMETER? 57% of respondents supported the issue
Statistic
STATISTIC OR PARAMETER? In a survey of 500 HS students, 60% intend to go to college
Statistic
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