In an experiment on the behavior of young children, each child is placed in an area with five toys. The response of interest is the number of toys that the child plays with.Past experiments with many subjects have shown that the probability distribution of the number of toys played with is as follows: Number of toys 0 1 2 3 Probability 0.05 0.20 0.44 0.31 Assume we sample a young child at random and let X be the number of toys this child plays with. (a) What is the expected value of X? (b) What is the variance of X? (c) What is the standard deviation of X?
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.
In an experiment on the behavior of young children, each child is placed in an area with five toys. The response of interest is the number of toys that the child plays with.Past experiments with many subjects have shown that the probability distribution of the number of toys played with is as follows:
Number of toys 0 1 2 3
Probability 0.05 0.20 0.44 0.31
Assume we sample a young child at random and let X be the number of toys this child plays with.
(a) What is the
(b) What is the variance of X?
(c) What is the standard deviation of X?
Now assume that we independently sample 14 additional children (that gives 15 children total in the sample) and then look only at whether or not they play with any toys. Let Y be the number of children in our sample who play with at least 1 toy.
(d) What is the distribution of Y and what are the parameters of that distribution?
(e) What are the expected value and the variance of Y ?
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