Discuss the difference between reliability and validity and how each are ensured when implementing assessments for students with moderate to severe disabilities. In addition, looking at the "Professional Development Presentation: Descriptive Statistics," how comfortable are you working with statistics? Why is it important to be familiar with statistics when looking at assessment data? Reliability - is the degree to which the result of a measurement, calculation, or specification can be depended on to be accurate. Validity - is the quality of being logically or factually sound; soundness or cogency. Reliability has to do with consistency of an accurate result. Validity has to do with how well the measurements, calculations or specifications, measure what it is meant to measure. For an assessment to be reliable it also needs to be valid. For example, when working on a students goals and collecting data - Sherry will write her first and last name correctly, improving her writing and spelling skills from 20% accuracy in 4 consecutive trials to 100% accuracy in 4 consecutive trials as measured by student work. What we are looking for is Sherry to write her first and last name correctly each time she is given same opportunity with 4 trial. A few years ago, I was working towards my BA in psychology and had to take a statistics class. I really struggled in the class and had to take it three times before passing with a C. I understand the basic concept of collecting data to show the progress our students are making as well as assessing where student present levels are. I get confused as to defining and describing how statistics work. Being familiar with statistics allows a teacher to properly collect, analyze, interpret, explain and present collected data on students to show present levels and student growth.
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