Question 6 1 1 Consider the following multiple linear regression model Y = Bo + BIX1+ B2X2+... +PDXp te Which of the following is TRUE of the least squares (LS) regression line for this model? The sum of residuals is always zero. If we can reject the null hypothesis Ho : 81 = 0 at the 95% confidence level, then we are 95% confident that there is a causal relationship between X1 and Y . There may be a linear relationship between X1, X2,..., Xp and the residuals of the least squares line. All of the above. O None of the above. D Question 7 1 pts In the 1994 film "Pulp Fiction", Vincent Vega was appalled that a milkshake cost $5 which, adjusting for inflation, roughly equals to $9.50 today. Assume that in 2022, milkshake prices follow a normal distribution with mean $5.50 and standard deviation $2. What is the probability of seeing a milkshake that costs at least $9.50? O 0.025 O 0.005 O 0.16 0.05