# Prob/Stats Ch. 1 Test

 statistics to collect, organize, analyze data individuals people or objects included in a study variable a characteristic to be studied (age, weight, gender, nationality, etc.) quantative a value or numerical measurement for operations such as addition or average qualitative characterizes an individual by grouping based on similarities (categorial) population data asking every individual in the population sample data data comes from some of the population (a sample of people) nominal level of measurement applies to data that consists of name, labels, or categories ordinal level of measurement applies to data that may be arranged in order. however, differences between data values either cannot be determined or are meaningless interval level of measurement applies to data that can be arranged in order. differences between data values are meaningful. no starting point and/or no zero ratio level applies to data that can be arranged in order. both differences between data values and ratios of data values are meaningful. data has a true zero simple random sample every member of the population has an equal chance of being included in the sample simulation a numerical representation of a real world phenomenon stratified sampling all members of the group (strata) are organized from the population based on characteristics. then a sample is drawn from the group systematic sampling members of the population are sequentially numbered. then, from a starting point, every kth member of the population is included in the sample clustered the entire population is divided into pre-existing segments or clusters (often geographic). clusters are randomly selected and every cluster member is included convenience sampling data are used from population members that are readily available census measurements and observations from an entire population sample measurements or observations from a representative part of the population should be observational study observations and measurements of individuals are conducted in a way that doesn't change the response or the variable being measured experiment measurement is deliberately imposed on the individuals in order to observe a possible change in the response or variable being measured placebo effect occurs when a subject receives no treatment but (incorrectly) believes he or she is in fact receiving treatment and responds favorably Authorlaurettaloo22 ID102620 Card SetProb/Stats Ch. 1 Test Descriptionch. 1 vocab Updated2011-09-19T00:03:05Z Show Answers