# probability

1. ### Number of ways to divide 12 people into 3 teams, where order matters or it does not

How many ways are there to categorize 12 people into 3 teams of 4? if order does not matter: 12!/4!4!4!3! or ((12 choose 4)(8 choose 4) (4 choose 4))/3! if order matters across teams: 12!/4!4!4! (or (12 choose 4) (8 choose 4) (4 choose 4)) Then, if order matters within teams or if order...
2. ### measuring student proficiency

Dear All, Below is my question; You are a statistics insctructor and you cover the topic of logistic regression. In order to ensure that your students understand the material , you create a short quiz covering the material from the section. --Among the students who take the quiz, those who...
3. ### How to get the odds of an event, based on its linear regression analisy?

As the title say. I have made a linear regression analisy of an event, and I got the concentration of probabilities at a given space of the Graphic (X, Y) ... so how to extract the odds of the event to happen by this linear regression analisy? This is the grahic:
4. ### Die With Multiple Same Sides

Hi everyone - see my problem below. With a regular die I know my denominator is 36 for each probability. What I'm wondering here is if that changes since multiple sides of the die have the same number... Right now I have the probability of a sum of 2 is 1/36, a sum of 3 as 2/36, sum of 4 as...
5. ### Probability / Statistics (Maybe Venn Diagram/Boolean)

So this is a bit confusing and I will try to explain the best way possible: 1 parent 1 parent = 2 Parents + + = No + - = No - +...
6. ### Probability of overlapping criteria

What is the best statistical method to measure the probability of people fitting a certain criteria in my data overlapping with another criteria? I am tasked to display this in a column/bar chart for a simple display of the consequence of its selection on other relevant pots of data.
7. ### Transportation network probability

I need a hlep because i didnt understand the course so If someone can help me for thi thank you very much
8. ### Gambling probability problem

A slot machine works on inserting a $1 coin. If the player wins, the coin is returned with an additional$1 coin, otherwise the original coin is lost. The probability of winning is 1/2 unless the previous play has resulted in a win, in which case the probability is p < 1/2. If the cost of...
9. ### emperical rule

does anyone understand this question? Thanks in advance!
10. ### joint probability

I am not really sure how to calculate question C. Can anyone help me out? Thanks in advance!
11. ### How to find the probability of a sampling error made in estimating the population mean?

Alright, I have been working on my statistics assignment since Monday and I only have two questions left, dealing with the probability of a sampling error. Unfortunately, I cannot find anything in my notes and only a brief example in my textbook that does not explain the concepts behind the...
12. ### normal distribution

Hi everyone! I have a question about the answer of question 19a and e. question a: Find the probability that X is greater than 60. Why do they do 0,5 -0,3944 and not 1 - ...? Question e was: the probability is 0,05 that X is in the symmetric interval about the mean between which two numbers...
13. ### poisson distribition question

Hello everyone, I don't really understand the answer of question a. The question was: Find the probability that on any given day there will be fewer than two breakdowns on this highwayduring the morning rush hour. Additional information: on average: 3,2 breakdowns per day occur. isn't it...
14. ### Defintion of a random variable

I have read two defintions for a random variable. 1. It is a function from the set of all posisible outcomes to the real line. For example Y("male")=0 2. A variable where known probabilities are associated with sample outcomes. Which one is correct? Defintion 1 does not include a probability...
15. ### Support vs sample space

I understand that the term support is not used in the same sense in mathamtics and statistics. However, I cannot really understand difference between support and sample space when it comes to statistics. Could you say that the support isa subset of the sample space, i.e. all sample points that...
16. ### Probability question

The govt. of ontario decided it would try to raise money by installing photo radar cameras on the 401 highway acros the top of Toronto. The camera would be set to record the speed of those travelling more that 135 km/h and send them a ticket for \$200. It would only run the program between the...
17. ### Am I using the binom.dist properly?

Q -Stats classhas 60 students in it. The class lasts for three hours and the students ask questions at a rate of about 3 questions per hour. Model this situation with an appropriate binomial distribution and determine the probability of receiving more than 5 questions in a class. My answer...
18. ### Odds Ratio to Probability of Success

We ran a logistic regression model with Passing the certification exam (0 or 1) as an outcome. We found that one of the strongest predictors is the student's program GPA, the highest the program GPA, the highest the odds of passing the certification exam. Standardized GPA: p-value < .0001, B...
19. ### Combined Probability

How do I solve this problem? Four departments: PE (6 team members), QA (8 team members), EE (5 team members), and AS (28 team members). If 8 team members are randomly selected, what is the probability that you will: 1) Have at least one team member from each department 2) All AS team members...
20. ### Probability Question

If you toss 100 fair coins (chance is 50% that it is heads) What is the chance that you will get 60 or more heads. Does anyone know how to calculate this probability? Thank you in advance!