statistics

  1. F

    Help with creating indicator age variable

    0 down vote favorite I am working on this project which needs to be done by tomorrow and I am stuck on creating the indicator variable. I am supposed to create indicator age variables for respondents that fit into the following age buckets. - Age 18-24 - Age 25-44 - Age 45-64 -...
  2. C

    please help with analysis confusion

    Hello Could you please help I am doing a study on leadership for my dissertation. I trying to find out which leadership style and the degree to which personality traits are preferred in a leader. In addition, I also want to find out which leadership style and the degree to which...
  3. S

    Permutation Testing to find significant molecules

    Apologies if this is quite a basic question but I'm fairly new to stats. I have a 24 x 70 matrix consisting of rows of 24 human serum samples and columns of protein intensity values for 70 different proteins. The 1st 12 rows are healthy people (type 1), the remaining 12 rows are patients...
  4. A

    Sum of squares model proof

    Hello everyone :-) I'm trying my best to prove the formula for the sum of squares model (please excuse how badly i'm going to write this) Betahat'X'Y-n(ybar)squared so far i have that it is equal to (yhat-ybar)'(yhat-ybar) so i just need to show that they equal eachother. I know...
  5. A

    Comparing groups- what test to use

    Hello, I am looking to compare the means for two groups (midfield - forward; top - bottom) against each other. Could someone please assist me in choosing what t test to use, or whether it is even a t test. an example of the data I am comparing is: Goals Top 5 Goals Bottom 5...
  6. R

    Mixed ANOVA difficulty ! HELP NEEDED

    Hello... im relatively new to psychology statistics and struggling to understand some things. My experiment is a 2 (common vs distinct faces )x 2 (control vs experimental condition) mixed repeated anova design The problem is the interaction between the faces and the conditions - how do i...
  7. T

    Binomial Distribution

    A company starts a fund of M dollars from which it pays $1000 to each employee who achieves high performance during the year. The probability of each employee achieving this goal is 0:10 and is independent of the probabilities of the other employees doing so. If there are n = 10 employees...
  8. H

    4 Vowel Intensities, Amplitude Spectrum of EEG - Multiple Logistic Regression?

    I have EEG recordings of the neural response to speech (a male vowel with a fundamental frequency of 100Hz). The vowel was presented to each subject (n=15) at four different intensities (55dB, 65dB, 75dB, and 85dB), and I ran FFTs and pulled the amplitude at all of the harmonics of the...
  9. S

    Help needed!

    I am having some trouble with the following problem... Investment trusts are companies whose sole activity is the owning of shares in other companies. Each trust may, typically, hold shares of 100 or more selected other companies. The dividends paid by investment trusts are thus the dividends...
  10. K

    Scatterplot relationship issue.

    Hi, the data below is just a sample of the data I am trying to enter into a scatterplot. The issue is that a previous correlation test shows a p value of 0.011, a clear relationship. However, when I took the averages of 196 entries of the data below, the scatterplot shows little...
  11. J

    Help with regression analysis and 95% confidence interval

    Hello! We have a couple of tasks for an assignment where we need to use regression analysis and 95% confidence interval, we're not sure on how to do it so figured I'd ask you guys for help. We don't really need the result of the actual task, but rather an detailed explanation to how to do...
  12. P

    Simple probability problem

    A glass jar contains 55 red and 25 blue marbles. What's the probability of choosing a red marble 16 times in a row. After a pick the marbles don't go back in the jar. Also what is the probability of picking 16 red marbles in a row if this experiment is repeated 10 and 20 times. Thanks
  13. A

    Probability Question

    Hello I am reviewing one of my exams for my final and am very confused when it comes to this question; The probability that at least one of the two chosen patients are less than 35 years old? Given: the sample size is 100. 43/100 of the patients are less than 35 and they are drawn at random...
  14. L

    I do not understand..

    Could someone list the steps using excel, mathcad, and/or minitab. Thank you. 1. Did the eight divisions in professional football score equally well on average? Justify your answer. 2. Compare the scoring performance of the two conferences. (I already asked a teacher for help and they did...
  15. D

    Kaplan Meier and Log Rank

    Hi all, I am doing cognitive testing and the subjects have 20 possible trials to reach criterion (90% accuracy). In my spreadsheet, I have it laid out as Column1: treatment group, column2: trials to reach criterion, Column3: status(whether or not they reached criterion). Is it appropriate to...
  16. F

    historical demographics from Census schedules - how to compare? what test to use?

    I have 1900 Census schedule sheets for several boarding schools. Ive gone through the trouble of transcribing the schedule sheets into a database, recording age, gender, race and place of birth of the students at each of the school. I want to compare each of the schools data to a model that I...
  17. S

    I Need Help with Poisson Distribution Problem!!

    I don't know where to even start with this Poisson Dist. problem, can anyone help me solve this??? The Hillel Sandwich Shop specializes in delivery of sandwiches in New York's financial district. Customers phone or fax Hillel their orders, which are then delivered directly to the customer's...
  18. G

    trying to figure how to create a stem/leaf chart

    hello to all. I have a homework assignment where i have to find the mean, median, mode, variance, etc. i did everything except the stem and leaf chart. I know what a stem and leaf chart is but in my home work example i get a little confused on how to do it exactly. This is the data chart...
  19. A

    Which test for my data analysis?

    Following this paragraph is my method to my research proposal. The next step I need to do is the planned analysis. I have absolutely no idea how to take the data from my research question (which for this class are fake numbers) and decide what to do with it. I know I need a test (T-test, ANOVA...
  20. M

    Correlation Help!!

    At a recent scotch-tasting party, 5 faculty members and their (opposite sex) spouses were guzzling it back pretty well. One person quite correctly noticed that the men seemed to be drinking more than the women. If the mean number of drinks had by the men was 7, and that for the women was 5, and...