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STT 200 Exam 1 Questions and Answers (100%
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Personal or Subjective Study Ans: the degree to which a given individual
believes that the event A will happen
Long Term Relative Frequency Ans: The proportion 'A' occurs if a
random experiment (circumstance) is reported many, many times
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The Law of Large Numbers Ans: when observations of a proportion are
independent, the sample proportion approaches the overall proportion
as the number of observations gets larger
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Raw Data Ans: Information that has been collected but has not yet
been processed
Categorical Ans: Variable places an individual or item into one of
several groups of categories, which are called levels
Numerical Ans: Variable takes on a wider ranger of numerical values.
Other names:
Measurement Variable
Quantitative Variable
Simple Random Sampling Ans: every member of the population has an
equal probability of being selected for the sample
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Stratified Sampling Ans: a variation of random sampling; the population
is divided into subgroups and weighted based on demographic
characteristics of the national population
Cluster Sampling Ans: A probability sampling technique in which clusters
of participants within the population of interest are selected at random,
followed by data collection from all individuals in each cluster.
Systematic Sampling Ans: select some starting point and then select
every Kth element in the population
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Selection Bias Ans: occurs if the method for selecting the participants
produces a sample that does not represent the population of interest
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Nonresponse Bias Ans: occurs when a representative sample is chosen
for survey, but a subject cannot be contacted or does not respond
Response Bias Ans: occurs when participants respond differently from
how they truly feel. The way questions are worded, the way interviewers
behave. as well as many other factors might lead an individual to
provide false information
Sampling Bias Ans: occurs if the method for selecting the participants
causes some individuals in the populations to be more or less likely to be
included in the sample than others
Convenience Sample Ans: a form of nonprobability sample using
respondents who are convenient or readily accessible to the
researcher—for example, employees, friends, or relatives