A Time Series Is Shown in the Table Below $\quad\quad\quad\quad\quad\quad\quad\quad\text { Week }$

question 33

Essay

A time series is shown in the table below: $\quad\quad\quad\quad\quad\quad\quad\quad\text { Week }$
$\begin{array}{|l|cccc|}\hline D a y & 1 & 2 & 3 & 4 \\\hline \text { Monday } & 16 & 15 & 18 & 21 \\\text { Tuesday } & 22 & 21 & 20 & 25 \\\text { Wednesday } & 20 & 23 & 20 & 24 \\\text { Thursday } & 29 & 28 & 32 & 28 \\\text { Friday } & 35 & 31 & 29 & 36 \\\hline\end{array}$ a. Compute the five-day moving averages to remove the seasonal and random variation.
b. Calculate the seasonal (daily) indexes.
c. What do the daily indexes tell us?
d. Find the regression trend line.
e. Calculate the seasonal indexes, based on the regression trend line developed in (d).

---

Definitions:

Online Sales

The process of purchasing goods or services over the internet.

Sleep

A natural and periodic state of rest during which consciousness of the world is suspended and the body's metabolic functions slow down.

Procrastination

The action of delaying or postponing tasks or decisions, often habitually.

Rental Car

A vehicle rented from a company for a specific period of time, typically used for transportation during travel when one's own car is unavailable.