# probabilities

1. ### interpreting logistic regressions... odds ratios v probabilities

Hi everyone! I am doing some analysis looking at various negative outcomes for children (child labour, begging, etc.) and comparing them with a range of households characteristics (child headed, large households, elderly headed households etc) The results show some interesting findings. For...
2. ### The true proportion of respondents

Fellow, stats lovers! I am now trying to remember my early statistics course in order to solve the following problem: 1) During the survey, 40% of the population maintain interest in mathematics. 1000 people were interviewed. With what probability can it be argued that the proportion of...

4. ### Determining sub-period probability from overlapping temporal probabilities

Hi. If the probability of an event (e.g. thunder) occurring in the 12 hours spanning 5 am to 5 pm is some value ...and... the probability of the same event (e.g. thunder) occurring in the 12 hours spanning 11 am to 11 pm is another value... can the probability of an event occurring in the 6...
5. ### Dependant Probability - Theoretical and Experimental have different outcomes?

Ok, I hope someone might be able to offer me some assistance into why i'm seeing a difference between what i believe to be the correct method to calculate dependant probability. Scenario: Coin bag of 8 weighted coins containing coins weighted for heads (0.5, 0.5, 0.6, 0.6, 0.7, 0.9, 0.5, 0.5)...
6. ### Probability of boxers winning in 10,50,100 matches. Binomial

In the final match a boxer is facing another boxer and is expected to win 48% of the time. In reality they win 80% of the time. What is the probability of that occurring in 10 matches? 2) In the very next match (in a different tournament), the boxer who won the previous match only wins 40% of...
7. ### Density probability function considering a subinterval which have different probabilities

Hi I was studying probability density and on a site I read this example Mr. Rossi waits for a phone call from Mr. Bianchi who has announced that he will call, in an unspecified instant, between 4:00 pm and 6:00 pm. Mr. Rossi must however be away from 4.45 pm to 5.00 pm. What is the probability...
8. ### I tried to calculate a probability problem..pls review my try?

I will be straight and simple on explanation: Abstract: I was playing bingo in a mobile game with my friend, and I wondered, "what is the probability of not getting a bingo?" Objective: to calculate probablity of not getting a bingo. Rules: * 5x5 board = 25 boxes total * only number 1-25...
9. ### Mean waiting time due to aggregation of k poisson arrivals

Dear Experts: I want to calculate the mean waiting time due to aggregation of k arrivals following poisson process with rate #λ#. Arrivals are served in chunk i.e., if N arrivals reach buffer, OR deterministic timer T expires. The timer ALWAYS starts at the first arrival. So, first arrival reach...
10. ### obtain inter-aarival from bulk arrival

obtain inter-arrival from bulk arrival I have some data regarding the arrival of customers at a shop. These arrivals are bulk arrivals which have been collected at fixed time intervals (say, t1=0+x,t2=t1+x,t3=t2+x,..). How can I convert these bulk arrivals to inter-arrivals? what about using...
11. ### Calculating predicted probabilities from a logistic regression model SPSS

Hello everyone, I am trying to calculate individual predicted probabilities from a logistic regression model with SPSS (to describe how a individual probability could be calculated from my model in an article). I was looking for a formula how the predicted probabilities in SPSS are calculated...
12. ### Event probabilities from the regression analysis

Hi, I am looking for all possible sources (literature, articles, books) with descriptions how to transform different kinds of regression analysis outputs in event probabilities (if feasible). Any help is wellcome. Thanks!
13. ### Medals at the Olympics

Hi, I love sports and stats and so I am doing my Olympics research. I saw that there are 2 players from China's on each Badminton competition (MS, WS, MD, WD, XD). I calculated the chances of each winning the gold medal and then I calculated the chances of them winning 0, 1,2,3,4 or 5 medals...
14. ### Shared car usage

Given a pool of C cars available to use by P people, the arrival rate of drivers to borrow cars is r, and the average trip time is t, how often will there be zero cars available for use?
15. ### Trying to handicap the outcome of a race based on given probabilities

Hello everyone. The past year or so I've been generating projection models for various sports to predict the performance of individual players. The approach varies by sport. I've stumbled onto one situation where I need to significantly improve my abilities in order to finalize the...
16. ### Probability Question - Express in terms of P

Hi, I am currently stuck on a probabilities question and I was wondering if anyone could help me a bit. A and B are two events. Suppose that P(B'|A) = 0.75 P(A'|B) = 0.6 P(A') = 0.4 A' and B' are complementary events of A and B respectively. Let P(B) = p, where 0<p<1. 1.Express P(A' n B) in...
17. ### Equal chance of random selection when halves of set are balanced?

Design: For 18 trials numbers (either 0 or 1) are randomly selected, a random portion of the first 9 are 0 and the last 9 are set as the opposite number of 0s. Within the first and last 9 the 0 or 1s are randomly assorted. The numbers are described as being in 3 consecutive groups of 6 called...
18. ### Percentage and probability

I have this problem I am trying to solve and I am not sure how. Lets say 70% of the demography is white people. Now if I randomly pick 100 people from the same demography, how do I calculate what is the probability there are exactly 70 white people? or more general question, how do I calculate...
19. ### Help with the statistics solving

Violations 0 0 1 2 3 4 5 >5 Fine A$1000 0 0 10 10 10 20 50 (Please note from the table that 0 violations = 0 fines, 1 violation = 0 fines, 2 violations =$10,000 fine, 3 violations = $10,000 fine, 4 violations =$10,000 fine, 5...
20. ### Help regarding z-scores and probabilities?

Can you help me understand how to do these 3 problems? Be specific, please. Here is my homework, word for word: Here we are given the probability, say .9 and we find the values of the random variable (-a and a) that determine a probability of .9 on a standard normal distribution...