When the Underlying Mean of a Time Series Is Very

question 9

Multiple Choice

When the underlying mean of a time series is very stable and there are no trend, cyclical, or seasonal influences:

• A) a simple moving-average forecast with n = 20 should outperform a simple moving-average forecast with n = 3.
• B) a simple moving-average forecast with n = 3 should outperform a simple moving-average forecast with n = 15.
• C) a simple moving-average forecast with n = 20 should perform about the same as a simple moving-average forecast with n = 3.
• D) an exponential smoothing forecast with a = 0.30 should outperform a simple moving-average forecast with α = 0.01.

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Definitions:

Genital Organs

The reproductive organs in both males and females, including external structures like the penis and vulva and internal structures like the uterus and testes.

Androgens

A group of hormones that play a role in male traits and reproductive activity.

Estradiol

A form of estrogen, a primary female sex hormone, significant for reproductive and sexual functioning as well as bone health.

Y Sex Chromosome

One of the two sex chromosomes, X and Y, that determine genetic sex in mammals; the presence of a Y chromosome generally leads to male development.