19. (2pts) Which of the following is NOT an assumption in simple linear regression? o The…

19. (2pts) Which of the following is NOT an assumption in simple linear regression? o The &i’s have variance o2. o The Ɛi’s are normally distributed. o The response variable y is normally distributed for each value of x. O The εi’s are linearly related to x. 20. (2pts) The Central Limit Theorem states that the sampling distribution of X1 – X2 is (approximately) normal: o When at least one of the sample sizes is greater than or equal to 30. o When the total number sampled is greater than or equal to 30. o When both of the sample sizes are greater than or equal to 30. O For all possible sample sizes. 21. (3pts) A power company uses a linear regression equation to predict a customer’s electricity usage (in kilowatt-hours, kwh) for Feb. 2020 from that customer’s usage during Feb. 2019. The equation is û = -1.05 + 0.75x where ŷ is the predicted usage in Feb. 2020 and x is usage in Feb. 2019. If a customer used 27.4 kwh in Feb. 2019, then what is the customer’s predicted Feb. 2020 usage?