Question

NGAGE INDIAP HW Consider the following time series. 1 2 3 4 5 6 7 82 61 44 34 31 28 34 a. Which of the following is the correct time series plot? 2o TimeSeriesValue 20+ 107 Time Perioditi 90 TimeSeriesValue 80+ 707

Answer 1

a) the time series plot is option c) number plot is correc

b)

y=c(82,61,44,34,31,28,34)
t=seq(1,7,1)#time
df=data.frame(y,t,t^2)#regress data
k=lm(df)#linear regression
k
and the value is

intercept=108

coefficient of t = -28.821

coefficient of t^2 = 2.607

T1= 108 -28.821*t + 2.607* t2

c) put t = 8 in above equation and find the forcast value

T1= 108 -28.821*8 + 2.607* 82

T1=44.28