The Following Time Series Gives the Number of Units Sold

question 22

Essay

The following time series gives the number of units sold during 5 years at a boat dealership.
a. Find the four-quarter centered moving averages.
b. Plot the series and the moving averages on a graph.
c. Compute the seasonal-irregular component.
d. Compute the seasonal factors for all four quarters.
e. Compute the deseasonalized time series for sales.
f. Calculate the linear trend from the deseasonalized sales.
g. Forecast the number of units sold in each quarter of year 6.

---

Definitions:

Birth

The process of giving birth; the emergence of a baby from the body of its mother.

High-risk Pregnancy

A pregnancy that poses potential complications or danger to the health of the mother, the baby, or both, requiring specialized care.

Infertility

The inability to conceive a child after a year or more of regular sexual intercourse without contraception.

Lactation Specialist

A healthcare professional specializing in breastfeeding, offering support and advice to breastfeeding mothers.