11. What is the primary goal of "differencing" in time series analysis? A. To remove seasonality from the data B. To remove outliers from the data C. To identify trends in the data D. To make the data stationary Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
12. Which time series forecasting method involves using a weighted average of past observations with exponentially decreasing weights? A. Moving Average B. Exponential Smoothing C. ARIMA D. Seasonal Decomposition of Time Series Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
13. In time series analysis, what is the purpose of the "seasonal differencing" step in the Box-Jenkins methodology (ARIMA modeling)? A. To remove outliers from the data B. To remove seasonality from the data C. To identify trends in the data D. To add noise to the data Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
14. Which statistical method is commonly used to test the stationarity of a time series data set? A. Augmented Dickey-Fuller test B. Chi-squared test C. Mann-Whitney U test D. t-test Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
15. What is the primary objective of "forecasting" in time series analysis? A. To analyze past data trends B. To predict future values C. To identify seasonality in the data D. To add noise to the data Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
16. What is the primary purpose of "lagging" in time series analysis? A. To identify seasonality in the data B. To remove outliers from the data C. To add noise to the data D. To identify trends in the data Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
17. In time series analysis, what is the "autoregressive" (AR) order in an ARIMA model? A. The order of differencing B. The order of the autoregressive component C. The order of moving average D. The order of seasonality Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
18. What is the primary goal of "seasonal differencing" in time series analysis? A. To identify seasonality in the data B. To remove seasonality from the data C. To make the data stationary D. To identify trends in the data Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
19. In the context of time series analysis, what is the "Box-Cox transformation" used for? A. To identify seasonality in the data B. To remove outliers from the data C. To transform non-normal data D. To add noise to the data Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
20. Which statistical test is commonly used to test for the presence of seasonality in a time series data set? A. Augmented Dickey-Fuller test B. Seasonal Decomposition of Time Series C. Ljung-Box test D. t-test Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
