Convert the data to centimeters (1 inchequals=2.54 cm), and recompute the linear correlation coefficient. What effect did the conversion have on the linear correlation coefficient?

it is not affected by a change of units

Step-by-step explanation:

Since the correlation coefficient has no dimensions, it is not affected by a change of units. Then it will remain the same after the conversion

In fact, the linear correlation coefficient ρ, where

ρ = Cov (X, Y) / (σx*σy)

then the units [ ] of ρ are

[ρ] = [ Cov (X, Y) ] / [σx]*[σy] = σ²/σ² = 1 → dimensionless

is more useful than using covariance [ Cov (X, Y) ], since dividing by the standard deviations eliminates the units and standardise the variable