41. Which statistical test is commonly used to assess the independence of residuals in a time series model? A. Augmented Dickey-Fuller test B. Ljung-Box test C. Granger causality test D. ACF (Autocorrelation Function) 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
42. In time series analysis, what does "stationarity" refer to? A. A constant mean and variance B. High seasonality and trend C. Large outliers D. Nonlinear patterns 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
43. What is the primary objective 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
44. 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
45. In time series analysis, what does the "autoregressive integrated moving average" (ARIMA) model combine? A. Autoregressive and moving average components B. Seasonal and trend components C. Exponential and linear components D. Seasonal and autocorrelation components 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
46. What is the primary goal of "exponential smoothing" in time series analysis? A. To identify seasonality in the data B. To add noise to the data C. To remove outliers from the data D. To forecast future values 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
47. In time series analysis, what is the purpose of "residual autocorrelation plots"? A. To identify seasonality in the data B. To test for autocorrelation in residuals C. To remove outliers from the data D. To assess the model's goodness of fit 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
48. Which statistical method is used to measure the strength and direction of linear relationships between time series data sets? A. Augmented Dickey-Fuller test B. Pearson correlation coefficient (PCC) C. Granger causality test D. Ljung-Box test 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
49. In time series analysis, what is the primary purpose of "Granger causality testing"? A. To identify seasonality in the data B. To test for causality between time series data C. To remove outliers from the data D. To determine the order of differencing 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
50. What does the "autoregressive" (AR) component in an ARIMA model represent? 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
