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Principles of Communication Engineering If a noise signal has a mean of 0 and a standard deviation of 1, what is its variance? (i) 0 (ii) 1 (iii) 2 (iv) 420242mSensors and Actuators Which of the following is not a type of sensor error? (i) Gross error (ii) Random error (iii) Systematic error (iv) Analog error20242mMACHINE LEARNINGA company wants to predict the sales (y) of a product based on its advertising expenditure (x). The observed data for 5 months is: | x (Advertising) | y (Sales) | |-----------------|-----------| | 1 | 3 | | 2 | 4 | | 3 | 2 | | 4 | 5 | | 5 | 7 | Calculate the regression coefficients for the linear regression model: y = w_0 + w_1 x Then, predict the value of y when x = 6.20257mMACHINE LEARNINGDescribe the evaluation metrics used in machine learning, such as accuracy, precision, recall, and F1-score, with a numerical example. Explain the importance of cross-validation in estimating a model's generalization performance.20257m