Quarterly demand levels for electricity

Reference no: EM13990549

Consider the following quarterly demand levels for electricity (in 1 000 megawatts) in Cape Town from 2008 to 2011.

Months	2008	2009	2010	2011
Jan-Mar	21	35	39	78
Apr-Jun	42	54	82	114
Jul-Sep	60	91	136	160
Oct-Dec	12	14	28	40

(a) Plot the time series of quarterly electricity demand graphically.

(b) Find the least squares trendline for quarterly electricity demand in Cape Town.

(d) Estimate the seasonally adjusted trend values of quarterly electricity demand for quarters 3 and 4 of 2012.

Excel tasks

(e) Use the Insert > Chart tab (line with markers) to plot the time series data in (a).

(f) Use the Add Trendline option (by right clicking on any data value in the line graph) to compute the least squares trendline for electricity demand in (b).

Reference no: EM13990549

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