S W 318 Midterm: Exam 2 Book Review Stats
Document Summary
Normal distribution a bell-shaped and symmetrical theoretical distribution with the mean, the median, and the mode all coinciding at its peak and with the frequencies gradually decreasing at both ends of the curve. Standard normal distribution a normal distribution represented in standard (z) scores, with mean = 0 and standard deviation = 1. Standard normal table a table showing the area (as a proportion, which can be translated into a percentage) under the standard normal curve corresponding to any z score or its fraction. Standard (z) score the number of standard deviations that a given raw score is above or below the mean. Disproportionate stratified sample the size of the sample selected from each subgroup is disproportional to the size of the subgroup in the population. Parameter a measure (e. g. , mean or standard deviation) used to describe the population distribution. Population a group that includes all the cases (individuals, objects, or groups) in which the researcher is interested.
