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AP Stats Random Quiz
Question | Answer |
---|---|
Bias | Failure of a sampling method to properly represent its population; bias sampling methods tend to under/over estimate population parameters |
Census | Sample that consists of an entire population |
Pilot | Small trial run of a survey to check if questions are clear; can reduce errors from ambiguous questions |
Population | The entire group of interest; samples are drawn from the population |
Random/randomization | Outcome is random if we know the possible values it can have, but not a particular result; each individual is given a fair chance of selection |
Representative | Sample is representative if the stats computed from the sample accurately reflect the population parameters |
Sample | Smaller group of individuals selected from the population |
Sample Size | Number of individuals in a sample |
Sample Survey | Survey that asks questions of a sample in the hope of learning something about the population |
Sampling Frame | A list of individuals from whom the sample is chosen |
Sampling Variability | (Sampling Error) Natural tendency of randomly drawn samples to differ |
Simulation | Models a real-world situation by using random digit outcomes to minimize the uncertainty of the response variable (variable of interest) |
Trial | Sequence of components in a simulation that produce a simulated answer |
Simple Random Sampling (SRS) | Each combination of people has equal chance |
Stratified Sampling | 1. Divide into homogeneous groups (strata) 2. SRS is used to choose some from each strata |
Systematic Sampling | 1. Pre-determined "ordered" list 2. Start with a randomly selected individual 3. Choose each "nth" person |
Cluster Sampling | 1. Divide into representative clusters 2. Randomly choose one or more entire clusters |
Multi-Stage Sampling | Combination of several sampling methods |
Voluntary Response Samples | Bad Sampling Technique, large group of individuals is invited to respond and all who respond are counted |
Convenience Samples | Bad Sampling Technique, include only the individuals who are convenient for us to sample |
Undercoverage | Some portion of the population is not sampled at all or has a smaller representation in the sample than in the population |
Voluntary Response Bias | When given the option to respond, the responses are often bias towards those with strong opinions or those who are strongly motivated |
Non-Response Bias | Very few surveys get everyone to respond and those who don't respond may have different opinions than those who do |
Response Bias | Anything in the survey design that may influence a response |