Statistics Summary Ch 4 Exam With Complete Solutions

Statistics Summary Ch 4 Exam With Complete Solutions Mean - answerThe arithmetic average of a data set. Most common measure of central location. To calculate the mean - answerAdd up all the values in the data set and then divide by the number of observations. Notation - answerseries or system of written symbols used to represent numbers, amounts, or elements in something such as music or mathematics. Numerical summaries of shape are - answernot covered because they are seldom used in practice. Gravitational center - answerMean X is the gravitational center of the distribution. Where the data would balance if placed on a seesaw. Susceptibility - answerSmall weight far from the center will counterbalace a large weight near the center. Three functions of the mean (A) - answerIt can be used to predict an individual value drawn at random from the sample. Three functions of the mean (B) - answerIt can be used to predict a value drawn at random from the population. Three functions of the mean (C) - answerIt can be used to predict the population mean. The mean from a frequency table - answerMean can be derived from a frequency table by calculating the weighted average of values with weights provided by the relative frequency (proportions) of each value using the formula. Sole reliance on a mean - answeroften misses the true picture. Median - answerThe midpoint of a distribution- the point that is greater than or equal to half of the values in the data set. Depth - answerThe smallest statistical rank (either up or down) of a set of data. Resistant - answerObserved variables often contain rogue outlier values that lie far away from the sample mean.