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### 24 Cards in this Set

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 Descriptive statistics the branch of statistics that involves the organization, summarization and display data Inferential statistics the branch of statistics that involves using a sample to draw conclusions about a population Qualitative data attributes, labels, nonnumerical entries Quantitative data numerical measurements or counts Nominal level of measurement Qualitative only. Categorized using names, labels or qualities. No mathematical computations can be made at this level Ordinal level of measurement Qualitative or quantitative. Data can be arranged in order but differences between data entries are not meaningful Interval level of measurement Quantitative. Data can be ordered and you can calculate menaingful differences between data entries. A zero entry simply represents a position on a scale, it is not an inherent 0. ZERO MEANS SOMETHING (0 degrees celsius) Ratio level of measurement Quantitative. Data can be ordered and you can calculate menaingful differences between data entries. A zero entry is an inherent 0. A ratio of two data values can be formed so one data value can be expressed as a multiple of another. ZERO MEANS NOTHING. Observational study study by observing Experimental study change a variable and observe result Simulation study machine/model produces situation or process Survey study ask people by phone, mail, etc. census count/measure of entire population sampling count/measure of part of a population random sample every member of the population has an equal chance of being selected simple random sample every possible sample of the same size has the same chance of being selected stratified sample population is divided into groups (strata) then a sample is selected from each cluster sample population is divided into groups (clusters) and sample is taken all members of one or more clusters, but not all systematic sample each member of a population is assigned a number, ordered, and a starting number is randomly selected. Sample members are selected at regular intervals from the starting number convenience sample consists only of available members of a population mean average of a set of numbers n1+n2+n3+nx ____________ x median middle # when data is arranged in order 1, 2, 3, 8, 10 =8 1, 2, 3, 4, 5, 8 =(3+4)/2=3.5 mode data with highest frequency 2, 1, 2, 3, 4, 2 =2 (unimodal) AB,O, A, B, A, O =A,O(bimodal) 3, 4, 7, 2, 3, 4, 7, 2 =none cannot have more than 2 modes modal class class with the highest frequency