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What is the difference between a qualitative and a quantitative assay?
In assays, or medical tests, both qualitative and quantitative tests occur. The qualitative test identifies the presence or absence of the pathogen or toxin (or other molecule) being tested for, while the quantitative test hopes to measure how much of that particular substance is in the body.
Why Benedict's qualitative test is called semi quantitative?
The Benedict's qualitative test is called semi-qualitative since it is not totally conclusive.
How qualitative and quantitative are similar?
It depends in which context your talking about, in the psychological context Quantitative data is number data such as results from a test, percentages Qualitative data is data where you take notes of what someone is saying or how they have been acting etc not involving numbers.
Why are statistical procedures such as t-tests and analysis if variances not appropriate for use in qualitative studies?
Because a t-test is designed to measure the difference between means on variables that can be measured (interval data). For example, comparing the difference of height between males and females in centimetres. Qualitative studies are not interval data, but qualitative information is coded and analysed by frequencies - you are not comparing two normally distributed variables that can be measured on a continuous spectrum of measurement.
What is the difference between a Qualitative Fit Test and a Quantitative Fit Test?
Respirator fit testing is performed to determine how well a respirator seal fits a persons face. Just like people try on shoes to make sure they are comfortable and fit well, a respirator must be fitted to insure maximum protection from contaminates and comfort. With a respirator if there is a leak or it is not worn properly the wearer could be exposed to potentially deadly chemicals. OSHA's regulation 1910.134 explains that employers are responsible for ensuring employees have a respirator fit test to ensure proper face piece to face seal.There are two methods for administering a respirator fit test. Those methods are qualitative and quantitative.Even though Qualitative methods are permitted by OSHA they are subjective and usually do not hold up if ever litigated. Qualitative fit testing uses a challenge agent like banana oil or saccharin. The test is subjective and relies on the workers sense of taste or smell. OSHA regulations only permit the use of qualitative testing for respirators that require an Assigned Protection Factor of 10 or less. This means if you perform a qualitative test on a full face respirator, that respirator cannot be used in concentrations greater than 10 times the chemical's permissible exposure limit.Quantitative respirator fit testing uses a device that measures exact leakage into the breathing zone of the respirator face piece. Contrary to popular perception, it actually takes less time to conduct a quantitative test then a qualitative because there is no taste or odor threshold screening time required.
