AP PSYCHOLOGY

Detailed explanation-1: -Standard deviation measures the spread of a data distribution. The more spread out a data distribution is, the greater its standard deviation.

Detailed explanation-2: -Measures of spread include the range, quartiles and the interquartile range, variance and standard deviation. When can we measure spread? The spread of the values can be measured for quantitative data, as the variables are numeric and can be arranged into a logical order with a low end value and a high end value.

Detailed explanation-3: -Standard deviation (SD) is the most commonly used measure of dispersion. It is a measure of spread of data about the mean. SD is the square root of sum of squared deviation from the mean divided by the number of observations. This formula is a definitional one and for calculations, an easier formula is used.

Detailed explanation-4: -The simplest measure of spread in data is the range. It is the difference between the maximum value and the minimum value within the data set. In the above data containing the scores of two students, range for Arun = 100-20 = 80; range for John = 80-45 = 35.

Detailed explanation-5: -The most common measure of variation, or spread, is the standard deviation. The standard deviation is a number that measures how far data values are from their mean.