How does random sampling eliminate biased selection?

Group of answer choices

Everyone has the same chance of being selected

Not enough information to decide

It depends who's doing the sampling

There is always biased selection

17. DISCUSSION - Weird things caused by chance

Why will unlikely events and weird occurrences happen just due to chance, even when the chance is almost zero that such events will occur?

Group of answer choices

not enough information to decide

Weird events will occur because there is so much opportunity for them to happen.

Fake news. These events don't happen.

The chance of occurrence is incorrectly computed

18. DISCUSSION - Vegetarians and intelligence

In a random sample of adults in a certain city,  IQ test scores are higher for vegetarians, on average, than for meat eaters.  Does this mean that becoming a vegetarian makes you smarter?   

Group of answer choices

No answer text provided.

No, observational studies don't allow a cause and effect conclusion.

Someone is cheating

Yes.

19. DISCUSSION - Where do you put the armor?

In World War 2, there was a project in Britain to put bulletproof armor on planes because so many allied planes were being shot down.  Planes returning from enemy lines were inspected for bullet holes and armor would be put on areas with the most bullet holes, because they were the most likely parts of the plane to be hit.  Then, a statistician working on the project said that this strategy was wrong, and that armor should be put on parts of the plane where there were NO bullet holes.  What was the statistician's reasoning?

Group of answer choices

No answer text provided.

The statistician was crazy.

You don't see the bullet holes on the planes that got shot down. Bullet holes on the planes that survived didn't cause the planes to crash.

not enough information to decide

20. DISCUSSION - Probabilities and areas under a curve

Discuss why probabilities for the normal distribution and other probability distributions are approximately the same as areas under the curve for a given interval.

Group of answer choices

Areas under a probability curve approximate the fraction of total area under the curve for the probability histogram, which graphically represents the probability distribution. Sometimes this curve has it's own mathematical representation, like the normal curve.

No answer text provided.

Depends on the curve.

The normal curve does not represent a probability distribution.