A researcher reports that when groups of four children are randomly selected from a population of couples meeting certain criteria, the probability distribution for the number of girls is given in the accompanying table. Find its variance. ( round the final answer in two decimal places) variance is x p(x) 0 0.478 1 .291 2 .076 3 .034 4 .121
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.
A researcher reports that when groups of four children are randomly selected from a population of couples meeting certain criteria, the
variance is
| x | p(x) |
| 0 | 0.478 |
| 1 | .291 |
| 2 | .076 |
| 3 | .034 |
| 4 | .121 |
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