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# Probability Distribution and Possible Outcomes

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TRUE OR FALSE (With justification)?

If in a probability distribution you got the sum of probabilities less than one, it may mean that you skipped some possible outcome/outcomes.

Health insurance policies are set up in such a way that a healthy person has a negative expected value, and a sickly person has a positive one.

If a distribution curve is bell-shaped, then this is a normal distribution.

If a distribution is normal, its curve is bell-shaped.

A normal distribution curve may be symmetric, left-skewed, or right-skewed.

Because the tails of the normal distribution curve are infinitely long, the total area under the curve is also infinite.

The higher the confidence level, the narrower the confidence interval.

A good way to decrease a confidence interval is to bring down the confidence level.

A good way to decrease a confidence interval is to increase the sample size.

Of these two formulas, 7-2 and 7-3, the first one never results in a greater sample size than the second formula.

A pre-election survey showed that Candidate A got 52%, and Candidate B got 48%. The margin of error is 3%. There is not enough reason for Candidate A to rejoice.