## Question

###### Is stationary (weak stationary)? Which of the following time sequence and b are constants_ i.i.d.(0,1) for all t â‚¬ R: X=a | bt | Et, where X =6 + tet-1' Et ~ i.i.d.(0,1) for all t â‚¬ R zero mean and unit X (-1)A, where A is a random variable with variance random variable with Uniform distribution cos( t where Y is (0,27) and t eR Vcos(2tt) , where U and are independent random Usin(2tt) variables, each with mean 0 and variance 1

is stationary (weak stationary)? Which of the following time sequence and b are constants_ i.i.d.(0,1) for all t â‚¬ R: X=a | bt | Et, where X =6 + tet-1' Et ~ i.i.d.(0,1) for all t â‚¬ R zero mean and unit X (-1)A, where A is a random variable with variance random variable with Uniform distribution cos( t where Y is (0,27) and t eR Vcos(2tt) , where U and are independent random Usin(2tt) variables, each with mean 0 and variance 1

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