Justify which of the following series are stationary?

Justify which of the following series are stationary?

(a) Google stock price for 200 consecutive days;

(b) Daily change in the Google stock price for 200 consecutive days;

(c) Annual number of strikes in the US;

(d) Monthly sales of new one-family houses sold in the US;

(e) Annual price of a dozen eggs in the US (constant dollars);

(f) Monthly total of pigs slaughtered in Victoria, Australia;

(g) Annual total of lynx trapped in the McKenzie River district of north-

west Canada;

(h) Monthly Australian beer production;

(i) Monthly Australian electricity production.

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