A contractor's records during the least five weeks indicate the number of job requests: Week 1 2 3 4 Request 24 23 22 21 5 18 Predict the number of requests for week 4 week 5, week 6 using each of the following methods: 1) Nave approach 2)2 -period moving average 3) 4-period moving average 4) Weighted moving average using 0.50, 0.40 and 0.10 assuming highest weight to the most recent week 5) Exponential smoothing with a = 0.20; use 24 for week 3 forecast