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Stats: Unit 1 Test
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Terms in this set (26)
qualitative data
Information describing color, odor, shape, or some other physical characteristic
quantitative data
numerical data that can be measured
(1.) how to design a statistical study
Identify our topic of interest and population we will work with
(2.) how to design a statistical study
Develop a detailed plan for collecting the data (if needed, get a good sample)
(3.) how to design a statistical study
Collect the data
(4.) how to design a statistical study
Describe the data using descriptive statistics
(5.) how to design a statistical study
Interpret the data and use inferential statistics about the population
(6.) how to design a statistical study
Identify any source of error
data collection methods
observing, surveying, simulations, and performing an experiment
placebo effect
subject reacts favorably to a placebo when in fact they were not given the actual treatment
blinding
subjects do not know if they received treatment or placebo
random sample
when every member of a population has the same chance of being selected
stratified sample
a population is divided into smaller groups that share a similar characteristic. A sample is then randomly selected from each group.
cluster sample
obtained by selecting all individuals within a randomly selected collection or group of individuals
systematic sample
every member of the population is assigned a number and you follow a pattern as to who is selected
convenience sample
when you pick people close by/easy for your survey
descriptive statistics
numerical data used to measure and describe characteristics of groups. Includes measures of central tendency and measures of variation.
inferential statistics
numerical data that allow one to generalize- to infer from sample data the probability of something being true of a population
undercoverage
occurs when some groups in the population are inadequately represented in the sample
nonresponse bias
the bias that results when respondents differ in meaningful ways from nonrespondents
voluntary response bias
occurs when sample members are self-selected volunteers, as in voluntary samples
response bias
results from problems in the measurement process and it can be anything in a survey design that influences responses
leading questions
questions that predispose a respondent to answer in a certain way
social desirability
a tendency to give socially approved answers to questions about oneself
population
an entire group of individual persons, objects, or items from which samples may be drawn
sample
a subset of the population
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