  In the setting of intermittent Pomeau-Manneville maps with time dependent
parameters, we show a functional correlation bound widely useful for the
analysis of the statistical properties of the model. We give two applications
of this result, by showing that in a suitable range of parameters the bound
implies the conditions of the normal approximation methods of Stein and Rio.
For a single Pomeau-Manneville map belonging to this parameter range, both
methods then yield a multivariate central limit theorem with a rate of
convergence.
