http:rtisuccessorg. Progress monitoring, one of the essential. components of Response to Intervention (RTI), is. characterized by repeated measurement of academic. performance that is conducted at least monthly. The. process may be used to assess studentsâ academic. performance over time, to quantify student rates of.
Calculating the Air Quality Index. The AQI is calculated by converting measured pollutant concentrations to a uniform index which is based upon peer-reviewed scientific evidence of the health effects associated with a pollutant.
When a frequency table is used, the variance can also be given by the formula: Where Æ is the frequency of each individual value and âÆ is the sum of the individual frequencies which is the same as n. For grouped or continuous data the same formula is used but the X value is taken to be mid-point of each group.here $ $ represents each of the $ $ data points, $ $ is the mean of the set of data points and $ $ is the number of data points in the data set. The standard deviation, $ $ , is the square root of the variance, $ $ :