Review of Statistics - Data Mining Questions with Correct Answers

Population data CORRECT ANSWER Data that comprises information of all individuals Sample data CORRECT ANSWER Data are from only some of the individuals of interest Variables CORRECT ANSWER Characteristics/features of the individuals to be measured or observed Qualitative variable (categorical variable) CORRECT ANSWER Describes an individual by placing the individual into a category or group, such as gender, nationality Population parameter CORRECT ANSWER a numerical measure that describes an aspect of a population Sample statistic CORRECT ANSWER numerical measure that describes an aspect of a sample Random Sampling Features CORRECT ANSWER Every sample of specified size n from the population has an equal chance of being selected No researcher bias occurs in the items selected for the sample random sample may not always reflect the diversity of the population. Random ≠ CORRECT ANSWER haphazard