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36 to 42 weeks is considered full-term. Anything before 36 weeks is considered premature. Preemies have all sorts of problems. Generally, the earlier the baby, the greater the risk of complications.
Standard deviation is a measure of total risk, or both systematic and unsystematic risk. Unsystematic risk can be diversified away, systematic risk cannot and is measured as Beta.
The minus means that you will risk the minus listed amount to win $100. Ex: -210 means you will risk $210 to win $100. The plus means that you will risk $100 to win the plus listed amount. Ex: +210 means you will risk $100 to win $210. Hope that Helps! Richard www.Betphoenix.com
A larger sample size will give more accurate answers but at a greater cost. The skill of a statistician is in determining the optimum sample size in the trade off between accuracy and cost. The costs are both in terms of the cost of collecting and processing additional information against the risk of getting the answer wrong.
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