please solve this with excel

4) Consider the following time series Month Value 1 118 2 112 3 100 4 94 5 96 ola 6 92 7 86 a Using excel construct a time series plot. What type of pattern exists in the data? b. Use simple linear regression analysis on excel to find the parameters for the best fit line What is the forecast for t = 8? d How reliable is thus fit? (Is it a good fit or not? How do you know) c