A Time Series Is Shown in the Table Below A Plot the Time Series to Determine Which of the

question 60

Essay

A time series is shown in the table below: $$\begin{array} { | c | c | } \hline \text { Time period } & y _ { t } \\\hline 1 & 48 \\2 & 50 \\3 & 46 \\4 & 42 \\5 & 40 \\6 & 32 \\7 & 34 \\8 & 26 \\9 & 21 \\10 & 13 \\\hline\end{array}$$ a. Plot the time series to determine which of the trend models appears to fit better.
b. Use the regression technique to calculate the linear trend line and the quadratic trend line. Which line fits better? Use the best model to forecast the value of y for time period 7.

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Definitions:

Mortgage Portfolio

A collection of mortgage loans held by a financial institution or investor.

Credit Swap

A financial derivative contract allowing two parties to exchange streams of interest payments or commodity flows for a set period, based on a predetermined notional principal amount.

Mortgage-Backed Securities

These are bonds secured by home and other real estate loans. They are created by pooling mortgages and then selling interests in that pool to investors.

FNMA

The Federal National Mortgage Association, known as Fannie Mae, a government-sponsored enterprise that provides liquidity to the mortgage market.