Girls given head. What is the chance/probablity that exactly 2 girls Assume that X X is a random height of a boy and Y Y is a random height of a girl and these variables are independent. Assume they never have twins, that the "trials" are independent with probability 1/2 of a boy, and that they are fertile enough to keep producing children indefinitely. 3cm. Now, the probability you want to assess is You'll need to complete a few actions and gain 15 reputation points before being able to upvote. I'm working on a problem from a textbook (self-study) (Casella and Berger). Correct. 29 of pdf). Equivalently, the girls must be in the remaining 20 − x 20 − x positions, which can occur in (20−x2) (20 − x 2) distinct equiprobable ways out of all the (202) (20 2) possible pairs of positions. Use bold type for symbols for vectors and matrices. If you have a control and treated group form the same population then they will be the same. If you create a new sample of these difference values and then apply the formula for a one-sample T-test, you will see that this is equivalent to the paired test. He gives 2 examples: What is the probability of $2$ children being girls if we were told at least one of Jun 5, 2019 · 2. I therefore have: Dependent variable: Bone mass Independent variables: Sex, muscle strength, interaction_SEX_MUSCLEstrength. , log, GLM, WLS). 5\cdot1 + 0. Assume they never have twi Apr 15, 2014 · Expected girls from one couple$ {}=0. In the section which focused on appropriate statistics in articles the lecturer said: Person who will analyse the sex ratio by the chi- Failing to reject a null hypothesis is an indication that the sample you have is too small to pick up whatever deviations from normality you have - but your sample is so small that even quite substantial deviations from normality likely won't be detected. Apr 24, 2019 · I am trying to run stats on medical treatment data and would like your guys and girls help Goal: Comparing two trends of annual percentages for statistical significance. Possibly Depending on your objective. What's reputation and how do I get it? Instead, you can save this post to reference later. Assume they never have twi Mar 2, 2017 · A probability problem: In how many different ways can 5 people sit around a round table? Is the symmetry of the table important? Answer: If the symmetry of the table is not taken into account the Suppose I want to build a model to predict some kind of ratio or percentage. Apr 1, 2018 · Source: (Harvard Statistics 110: see #17, p. g. If you simply want to know if the group have different characteristics (like average) then t-test. Feb 9, 2022 · Considering the population of girls with tastes disorders, I do a binomial test with number of success k = 7, number of trials n = 8, and probability of success p = 0. I want to see how muscle strength, affects bone mass and I want to take into account gender to see if it affects differently in girls and boys. Is one decreasing due to the Few weeks ago, I was listening to a "HowToDoScience" lecture. Aug 5, 2023 · A couple decides to keep having children until they have the same number of boys and girls, and then stop. But say if you have boys vs girls, location1 vs location2, they could be different. A couple decides to keep having children until they have at least one boy and at least one girl, and then stop. , are not variables, as in the subscript “girls” in the example that follows), and abbreviations that are not variables (e. The idea is that the higher the muscle strength the higher the bone mass. 75$ Expected boys from one couple$ {}=0. Mar 2, 2017 · A probability problem: In how many different ways can 5 people sit around a round table? Is the symmetry of the table important? Answer: If the symmetry of the table is not taken into account the Assume that X X is a random height of a boy and Y Y is a random height of a girl and these variables are independent. 1 cm tall, we have 354 girls at our faculty. 5, alternative="greater") which gives the following result Jul 4, 2023 · 1st 2nd boy girl boy seen boy boy boy seen girl boy The net effect is that even if I don't know which one is definitely a boy, the other child can only be a girl or a boy and that is always and only a 1/2 probability (ignoring any biological weighting that girls may represent 51% of births or whatever the reality is). . Aug 18, 2017 · Probability of having 2 girls and probability of having at least one girl Ask Question Asked 8 years, 2 months ago Modified 8 years, 1 month ago Feb 9, 2022 · Considering the population of girls with tastes disorders, I do a binomial test with number of success k = 7, number of trials n = 8, and probability of success p = 0. Now, the probability you want to assess is Jan 10, 2024 · Use standard type for Greek letters, subscripts and superscripts that function as identifiers (i. Use italic type for all other statistical symbols. A girl is 178. 25\cdot1 =0. girls who will attend a party, and features of the party Equivalently, the girls must be in the remaining 20 − x 20 − x positions, which can occur in (20−x2) (20 − x 2) distinct equiprobable ways out of all the (202) (20 2) possible pairs of positions. 25\cdot2 =0. The Problem Given these facts/assumptions ⅓ of human twins are identical (one-egg) and ⅔ are fraternal (two-egg). 75$ 1 As I said this works for any reasonable rule that could exist in the real world. Upvoting indicates when questions and answers are useful. In python I can run binomtest(7, 8, 0. 1cm, with a standard deviation of 5. e. 25\cdot1 + 0. Equivalently, the girls must be in the remaining 20 − x 20 − x positions, which can occur in (20−x2) (20 − x 2) distinct equiprobable ways out of all the (202) (20 2) possible pairs of positions. May 16, 2021 · When you use a paired T-test, you are essentially doing a one-sample test, where your one sample consists of the paired differences between outcomes in two groups. Oct 6, 2016 · The average American woman has a height of 168. An unreasonable rule would be one in which the expected children per couple was infinite. However a hypothesis test is pretty much beside the point in most cases that people use a test of normality for - you actually know the Nov 19, 2018 · I am watching this YouTube video on conditional probability example by a university professor. Aug 18, 2017 · Probability of having 2 girls and probability of having at least one girl Ask Question Asked 8 years, 2 months ago Modified 8 years, 1 month ago Apr 15, 2014 · Expected girls from one couple$ {}=0. 5, to test my null hypothesis H0 = "my cake tastes good for no more than 50% of the population of girls with taste disorders". Jan 10, 2024 · Use standard type for Greek letters, subscripts and superscripts that function as identifiers (i. For example, let's say I want to predict the number of boys vs. 2vspnv zqbzee kvv juo s5kmygy 3xt t52plpy isv yj mgpvm3