I If the Sales, Production or Other Data Over a Period

question 4

Multiple Choice

i. If the sales, production or other data over a period of time tend to approximate a straight-line trend, the equation developed by the least squares method cannot be used to forecast sales for a future period. ii. A straight-line trend equation is used to represent the time series when it is believed that the data is increasing(or decreasing) by equal amounts, on the average, from one period to another.
iii. If the past data approximates a straight line, the equation used is = a + bt, where a is they-intercept and b is the slope of the line.

• A) (i), (ii), and (iii) are all correct statements.
• B) (i) and (ii) are correct statements but not (iii).
• C) (i) and (iii) are correct statements but not (ii).
• D) (ii) and (iii) are correct statements but not (i).
• E) (i), (ii), and (iii) are all false statements.

---

Definitions:

Ionic Compound

An ionic compound is a chemical compound composed of ions held together by electrostatic forces termed ionic bonding, typically formed between metal cations and non-metal anions.

Phosphorus

A reactive, non-metallic element found in Group 15 of the periodic table, essential for life.

Calcium

A chemical element with the symbol Ca and atomic number 20, a reactive, pale yellow metal that forms compounds with many other elements.

Ionic Formula

A notation that represents the composition of an ionic compound by showing the ratio of ions present in the compound.