Rickets Vitamin D, whether ingested as a dietary supple-ment or produced naturally when sunlight falls on the skin, is essential for strong, healthy bones. The bonedisease rickets was largely eliminated in England duringthe 1950s, but now there is concern that a generation ofchildren more likely to watch TV or play computer gamesthan spend time outdoors is at increased risk. A recentstudy of 2700 children randomly selected from all parts ofEngland found 20% of them deficient in vitamin D.a) Find a 98% confidence interval.b) Explain carefully what your interval means.c) Explain what “98% confidence” means.

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Contingency Table

A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.

Binomial Distribution

Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.