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Which type of study would be the highest level of evidence assessing the responsiveness of the Berg Balance Scale?

You are reading an article which states there is a correlation of 1.0 between a performance-based measure that tests for fall risk and a patient-reported outcome measure about the concern of risk for falls. This suggests excellent:

A measure assesses activity limitations associated with low back pain.  Analysis of that measure establishes that all activities that might be affected by low back pain are included.  This outcome measure demonstrates excellent:

What would be the problem with a test-retest reliability study that assessed patients’ performance on a measure of cardiovascular performance at the beginning and end of their hospital stay? 

Which psychometric property refers to an outcome measure’s ability to measure the characteristic or feature it is intended to measure?

A) Define contrast and resolution in Microscopy (2 points)B) Include when contrast is important and when resolution is important. (When would you setup a microscope for contrast and when would you would setup a microscope for resolution?) (2 points)

Electrophoretic separation (electrophoresis) of particles depends on two forces.  They are: (check all that apply)

You are designing an assay to determine the concentration of Solution ABC using Beer’s Law.  First, you perform an absorption spectrum analysis of Solution ABC, which is shown below.  To determine concentrations of unknown Solution ABC, the following should be performed:a) Set the spectrophotometer to read absorbances at wavelength [W] (2 points) b) with the reason being [r].  (2 points)  

Refer to the following graph: A new methodology for an assay has been developed and compared with the existing method.  The scatterplot from the Comparison of Methods Study is illustrated in the graph shown above.  The new method can be described as:

____________________ is used in gas chromatography to improve the quality of the sample result by making an analyte more volatile.