Chlorine dioxide (ClO 2) is a gas that can be used for water disinfection. To date, only uncut and unpeeled produce can be contacted with ClO 2. Chlorine dioxide has been given a USDA 3-D approval for washing fruits and vegetables to be used as ingredients of meat and poultry products.he chemicals that make up chlorine dioxide can also be easily identified by the user. Sodium chlorite is a white crystalline powder. One of its physical characteristics is its ability to absorb moisture. The other component of chlorine dioxide, hydrochloric acid, is a colorless liquid.
The validity of a test refers to whether the test measures what it is supposed to measure. The three most common types of validity are face validity, empirical validity, and construct validity. We consider these types of validity below.
How do you Determine if a Test has Validity, Reliability, Fairness,and Legal Defensibility? 1Professional Testing Inc.Â© PTI 2006 1. Validity Validity is arguably the most important criteria for the quality of a test. The term validityrefers to whether or not the test measures what it claims to measure. On a test with highvalidity the items will be closely linked to the test's intended focus. For many certificationand licensure tests this means that the items will be highly related to a specific job oroccupation. If a test has poor validity then it does not measure the job-related contentand competencies it ought to.