Use the following to answer questions 1-4:

The Figure below is the time series plots showing the monthly housing sales, the US treasury bill contracts, the Australian quarterly electricity production and the daily change in the Google closing stock price by year.

Each plot shows different combinations of the time series components.

1. The monthly housing sales
2. The US treasury bill contracts
3. The Australian quarterly electricity production
4. The daily change in the Google closing stock price

2. Which of the time plot suggests a seasonal variation? Choose all that apply.

1. The monthly housing sales
2. The US treasury bill contracts
3. The Australian quarterly electricity production
4. The daily change in the Google closing stock price

3. Which of the time plots suggests cyclic behavior? Choose all that apply.

1. The monthly housing sales
2. The US treasury bill contracts
3. The Australian quarterly electricity production
4. The daily change in the Google closing stock price

4. Which of the time plot suggests random fluctuations that is not predictable? Choose all that apply.

1. The monthly housing sales
2. The US treasury bill contracts
3. The Australian quarterly electricity production
4. The daily change in the Google closing stock price