The following time series shows the number of junk email messages that Ashar Nazir has received in each of the most recent seven months. 1 2 3 4 5 6 7 122 111 102 97 93 92 90 (a) Construct a time series plot. (b) Use simple linear regression analysis to find the parameters for the line that minimizes MSE for this time series. (Round your numerical values to two decimal places.) (c) What is the forecast for t = 8? (Round your answer to one decimal place.)