Estimate and interpret the linear trend model with seasonal dummy variables.

Use the estimated model to make a consumer sentiment index forecast for December 2018.

Date	Consumer Sentiment
Jan-10	74.4
Feb-10	73.6
Mar-10	73.6
Apr-10	72.2
May-10	73.6
Jun-10	76.0
Jul-10	67.8
Aug-10	68.9
Sep-10	68.2
Oct-10	67.7
Nov-10	71.6
Dec-10	74.5
Jan-11	74.2
Feb-11	77.5
Mar-11	67.5
Apr-11	69.8
May-11	74.3
Jun-11	71.5
Jul-11	63.7
Aug-11	55.8
Sep-11	59.5
Oct-11	60.8
Nov-11	63.7
Dec-11	69.9
Jan-12	75.0
Feb-12	75.3
Mar-12	76.2
Apr-12	76.4
May-12	79.3
Jun-12	73.2
Jul-12	72.3
Aug-12	74.3
Sep-12	78.3
Oct-12	82.6
Nov-12	82.7
Dec-12	72.9
Jan-13	73.8
Feb-13	77.6
Mar-13	78.6
Apr-13	76.4
May-13	84.5
Jun-13	84.1
Jul-13	85.1
Aug-13	82.1
Sep-13	77.5
Oct-13	73.2
Nov-13	75.1
Dec-13	82.5
Jan-14	81.2
Feb-14	81.6
Mar-14	80.0
Apr-14	84.1
May-14	81.9
Jun-14	82.5
Jul-14	81.8
Aug-14	82.5
Sep-14	84.6
Oct-14	86.9
Nov-14	88.8
Dec-14	93.6
Jan-15	98.1
Feb-15	95.4
Mar-15	93.0
Apr-15	95.9
May-15	90.7
Jun-15	96.1
Jul-15	93.1
Aug-15	91.9
Sep-15	87.2
Oct-15	90.0
Nov-15	91.3
Dec-15	92.6
Jan-16	92.0
Feb-16	91.7
Mar-16	91.0
Apr-16	89.0
May-16	94.7
Jun-16	93.5
Jul-16	90.0
Aug-16	89.8
Sep-16	91.2
Oct-16	87.2
Nov-16	93.8
Dec-16	98.2
Jan-17	98.5
Feb-17	96.3
Mar-17	96.9
Apr-17	97.0
May-17	97.1
Jun-17	95.0
Jul-17	93.4
Aug-17	96.8
Sep-17	95.1
Oct-17	100.7
Nov-17	98.5
Dec-17	95.9
Jan-18	95.7
Feb-18	99.7
Mar-18	101.4
Apr-18	98.8
May-18	98.0
Jun-18	98.2
Jul-18	97.9
Aug-18	96.2
Sep-18	100.1
Oct-18	98.6
Nov-18	97.5