experimental design method - systematic method of investigation using experimentation, observations, and deductive reasoning (making inferences), quantitative observations - observations made using numbers, measuring tools, and amounts, qualitative observations - observations made using the 5 senses, inference - an interpretation or explanation using observations and prior knowledge, hypothesis - a possible explanation for observations that relate to a scientific question, variable - any factor in an experiment that can change, independent variable / manipulated variable - the variable that the experimenter changes, dependent variable / responding variable - the variable that changes as a result of the independent variable being changed; a response, constants - the variables that remain the same each time the experiment is conducted, repeated trials - the number of times an experiment is repeated to eliminate errors, experimental test group - the group(s) that receive special treatment or that are changed in some way, control - the group that others are compared to or the group that receives no special treatment, data analysis - finding the mean, median, mode from data collected, mean - the average of the data (add the numbers and divide by the number of data points collected), median - the middle number; rank the data from smallest to largest and choose the middle, mode - the most frequently occurring number in a set of data, data - facts, figures, and other evidence gathered through observation, experimental error - mistakes that skew (mess up) the results, scientific theory - a well-tested scientific concept that explains a wide range of observations,

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