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

question 62

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.

---

Definitions:

Risky Behaviour

Actions that expose individuals to harm or substantial risk of negative consequences.

Adolescents

Individuals in the transitional stage of human development that occurs between childhood and adulthood, typically between ages 10 and 19.

Early Maturation

The process in which an individual reaches physical and sexual development earlier than the average age for their peer group.

Eating Disorders

Mental disorders characterized by abnormal or disturbed eating habits that negatively affect a person's health.