Select the appropriate descriptions of the correlation coefficient (r). r describes the clustering of the points around a line, relative to the SDs.
r says how the average value of y depends on x.
r determines the accuracy of the regression predictions, through the formula for r. m.s. error.
All of the above are accurate descriptions of the uses of r.

triangle abc is reflected on the line x=-6.5 then reflected again on the x axis

step-by-step explanation:

bull

step-by-step explanation:

12cm

the answer is d

step-by-step explanation:

we can use this expression to calculate the energy gain as a particle moves with a field or the energy loss as it moves against it. (note that it is also used to define the electron-volt, a unit of energy equal to that gained by an electron as it falls through a pd of 1 v, i.e. w = 1 ev = 1.6 10-19 c 1 v = 1.6 10-19j).in fact this expression is really nothing more than the statement that potential is the potential energy per unit charge. in this case, v= w/qis simply stating that the change in potential energy(or work done) per unit charge is equal to the change in potential (or potential difference), v.student questions: uniform electric fields2electron beamcathode+5 kvanode0 v