probability - What is the expected number of children until having …
Aug 5, 2023 · You can consider starting from position 1 for the difference of boys/girls and move up and down randomly with 50% probability until reaching zero. These type of walks have been described here: What is the distribution of time's to ruin in the gambler's ruin problem (random walk)? and based on the results in those answers we can see that the ...
Two-way ANOVA when data is non-normally distributed
Jan 27, 2020 · I'm trying to navigate my way through the assumptions but need some assistance. Specifically, I have two groups as the IVs (1: Boys and Girls; 2: Yes and No), and a real number between 0 and 1 as the DV. Firstly, I know there is no assumption related to equal sample sizes, but mine are really quite different: Girls. Yes = 190. No = 58. Boys ...
probability - What is the expected number of children until having …
Apr 1, 2018 · $\begingroup$ That can't be right, and you can see that by noting that the MINIMUM number of children is 2. If the expected number of children = the minimum number of children, it must be that there is no possibility of having more children than the minimum number - otherwise the expected number of children would be greater than the minimum number...
Learning probability bad reasoning. Conditional and unconditional ...
(Source: Minka.) My neighbor has two children. Assuming that the gender of a child is like a coin flip, it is most likely, a priori, that my neighbor has one boy and one girl, with probability 1/2. The other possibilities—two boys or two girls—have probabilities 1/4 and 1/4. a. Suppose I ask him whether he has any boys, and he says yes.
what is the difference between a two-sample t-test and a paired t …
May 16, 2021 · While I was glancing at hypothesis tests, I saw paired and two-sample t-test but couldn't understand the difference. For the explanation of these two tests, I saw the following sentence " Two-...
Why is gender typically coded 0/1 rather than 1/2, for example?
$\begingroup$ Using a 0/1 coding scheme is essentially useful when applying regression models among others, although several coding schemes are possible, e.g. -1/1 (but it will change the interpretation of the regression coefficients).
Significance test for difference in two proportions over time with ...
Oct 8, 2019 · So, for example, the proportion of 3rd graders with blonde hair, comparing boys and girls, if every year I measured a sample of 3rd grade boys and girls. I thought of this perhaps as a repeated measures analysis, but decided against it because these are actually independent samples, each year there is a total new crop of 3rd graders.
self study - How to Solve this Conditional Probability Problem ...
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Interpretation of regression coefficients with multiple categorical ...
Sep 26, 2021 · It's the difference between the (predicted) mean of girls in girls-only schools and the (predicted) mean of girls in mixed schools. You can see this by looking at the design matrix or solving for a predicted value using the fitted regression equation. Let's make some simple data and work through this.
regression - Building a linear model for a ratio vs. percentage ...
Echoing the first answer. Don't bother to convert - just model the counts and covariates directly. If you do that and fit a Binomial (or equivalently logistic) regression model to the boy girl counts you will, if you choose the usual link function for such models, implicitly already be fitting a (covariate smoothed logged) ratio of boys to girls.