# binomial distribution

1. ### Binomial Problem: Help!!

Hey all, so I've been trying to understand this binomial problem for the last couple hours and its just not happening. Here's the problem: A sample of 12 were chosen at random (one at a time) from a large population of people in which 80% favor capital punishment. (A) Determine the...
2. ### Binomial Distribution Problem

Hi I have a question about binomial distribution/probability. The question is: Below are data on the fertility of eggs from a strain of Drosophilia. 10 eggs were placed in each of 100 vials with the eggs in different vials coming from different females. All eggs either hatched or died. Is...
3. ### Probability

this is my question Suppose 20% of the items produced by a factory are defective. Suppose 12 items are chosen at random. Find the probability that 2 are defective. How to solve this ? Is this a binomial distribution question ?
4. ### model comparisons for a binomial distribution

Dear all, I have a stats question that relates to a bigger piece of research, but I've simplified the bit I'm confused about... Suppose I run an experiment 10 times (M=10) where for each experiment I toss a coin 20 times (n=20), I have for each experiment the number of heads (x). From this...
5. ### URGENT Year 11... Bionomial distribuition question

Assume that a particular virus protection software has a 0.90 probability of detecting Find the probability that two independent virus protection programs will detect the virus attack. Given that three independent virus protection programs are installed, find the probability that at least...
6. ### Comparing 2 means (binomial distribution type) between 2 groups

Hi, I feel stupid for asking this, but I have a basic "why" question about obtaining the mean values to later run a 2-sample t-test to see if 2 groups are significantly different. I've read online that for binomial distributions (ie yes/no answers, successes/failures, etc) the mean = np, where n...
7. ### Calculating the size of Type 1 error, Type 2 error and power of the test

Let X have a binomial distribution with parameter n=5 and P\in [p:p=\frac{1}{4},\frac{1}{2}]. The null hypothesis H_{0}:P=\frac{1}{4} is rejected, and The alternative hypothesis H_a:P=\frac{1}{2} is accepted. If the observed value of X_1, a random sample of size one, is less than or equal...
8. ### How can i comment on the following graphs of Binomial distribution.

I am using 'R' to draw the graph : par(mfrow=c(2,2)) graph(10,0.05) graph(20,0.05) graph(50,0.05) graph(200,0.05) How can i comment on the graphs? Does it " as number of trials increases, probability of getting the zero success decreases" ?
9. ### Using the Right Test to Confirm Separation of Confidence Intervals

Hello, I'm working on a research project (not homework) and I could benefit from a quick consult since some of my stats are a bit rusty. I have a series of experiments that qualify as Bernoulli trials, so I am estimating 95% confidence intervals on the success rates assuming the binomial...
10. ### Normal Approximation to the Binomial Distribution Help Needed

SOLVED - Normal Approximation to the Binomial Distribution Help Needed A multiple choice test consists of a series of questions, each with four possible choices. a) If there are 60 questions, estimate the probability that a student guessing blindly on each question will get at least 30 right...
11. ### Binomial Distribution

I am in dire need of some help with binomial distribution! In a given year, the probability that an adult American male dies in a car accident is equal to 0.0002. a) In a city having 1 million adult American males, state assumptions for a binomial distribution to apply to X= the number of them...
12. ### Binomial Distribution

One classical experiment on ESP (extrasensory perception) tests for the ability of an individual to show telepathy-that is, to read the mind of another individual. This test uses five cards with different designs, all known to both participants. In a trial, the "sender" sees a randomly chosen...
13. ### What statistics to use to find a possible correlation of coinciding null results?

I would like your advice on the following problem: I am investigating the following data: For 600 trials data was gathered simultaneously from two sources (locations in rats brain). Each trial was investigated and either a result was found (some time stamp) or no result was found (a "zero...
14. ### Binomial Distribution, 150 tosses of fair coin, P(40%<= X <=50%)

Hi, im getting the wrong answer for the following question and not sure why. (Question) A fair coin is tossed 150 times. Find the probability that between 40% and 50% (inclusive) of the tosses will result in heads. (I know its possible to do this proportions but i prefer to do it with...
15. ### Poisson or Binomial

Hi, im trying to make sure i have the difference between when to use Binomial and Poisson distributions firmly understood. Regarding the following question, im assuming its a Binomial since its possible to determine p and q even though a rate is specified? Question) If a baseball batter hit 4...
16. ### Binomial Distribution

I really need help with this homework. I've been on one question for over an hour. The Question is The rates of on-time flights for commercial jets are continuously tracked by the U.S. Department of Transportation. Recently, Southwest Air had the best reate with 80 % of its flights arriving...
17. ### Feedback sought on finding a probability based on a permutation / binomial D

Hi everyone, I've just signed up and I'm posting this here (and not in the other probability section) since it's not a course or homework problem. Nonetheless it may appear as simple and straightforward to someone versed in probability stuff... It's for a research project I'm assisting and...
18. ### A two-outcome game on a limited budget: the probability of being busted over n tries

Hello, My question does not regard a piece of homework, but I have become stuck trying to solve a statistical problem and I would really appreciate the help of this forum. The problem is as follows: A gambler has a budget of 100\$. She plays a game consisting of consecutive rounds in each of...
19. ### Differentiating between different distributions

In my last 3 statistics classes I have learned about several different kinds of distributions: the binomial probability distribution the normal probability distribution sampling distributions I am findng it difficult absorbing all this information regarding distributions at once and...
20. ### Binomial Probability, Real Limits, X=0

Can someone have guessed on quiz and got all 50 questions wrong, but still get 100%? Thanks in advance! :D