Let X denote 0.025 × the ambient air temperature (˚C) and let Y denote the time (min) that it takes for a diesel engine to warm up. Assume that (X, Y) has joint probability density function f(x,y) = 1.6x (1 − x)(6 + 5x − 4y), for 0 < x < 1, 0 < y < 0.5. Find the conditional pdf of Y, given X = x. Compare this to the marginal pdf of Y.  Are air temperature and engine warm-up time independent?

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Let X denote 0.025 × the ambient air temperature (˚C) and let Y denote the time (min) that it takes for a diesel engine to warm up. Assume that (X, Y) has joint probability density function

f(x,y) = 1.6x (1 − x)(6 + 5x − 4y), for 0 < x < 1, 0 < y < 0.5.

Find the conditional pdf of Y, given X = x. Compare this to the marginal pdf of Y.  Are air temperature and engine warm-up time independent? 

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