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Bias
every person in the population has the same chance of being selected.
Yes, the offspring has a 50% chance of being polled. The polled gene is dominant over the horned gene, so if the bull does not carry the horned gene, the offspring will not have horns.
This type of natural selection is called stabilizing selection because the mean traits of the population are being selected for against the immediate environment.
Horns can create a hazard to children, the local 4h requires that all goat being shown not have have horns. So polled would be better for a child.
A non-random selection is one in which all of the people do not have equal chance of being included in the sample.
A population with differences has much better chance of surviving diseases.
That would be the Stabilizing Selection where there will me not a lot of genetic variation. The curve of the population allele frequency would be quite thin with the extreme being in the middle.