help needed

  1. F

    Seeking Stats/Maths Experts for Help Determining Possible Analysis of Complex Data

    Dear all, I have recently started a new job and have taken on a large and complex data set. I do not think meaningful analysis is possible, but I am hopeful that I am wrong. I am seeking answers to two questions; 1. Have I correctly calculated the possible combinations of answers & if so...
  2. B

    Hypothesis Test Help!

    Here is what I have thus far. My teacher has a theory that 40% of students at the university are female. I needed to survey 30 random students and asked them if they think 40% of students are female. 22 said yes while 8 said no. I need to carry out a hypothesis test to claim his...
  3. 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...
  4. Q

    Need some help with my statistic assignment

    Ok so I'm having some trouble in my statistics assignment. the task is explaining this: model <- aov(rt ~ gender*prime + Error(subject/prime)) What datalevel do rt have to be? what is the variable rt called? what datalevel is gender and prime? what are these variables called? explain...
  5. L

    Which test is appropriate?

    I'm trying to test whether time (IV1) has an effect on the relationship between a specific personality feature (IV2, quasi-continuous) and scores on a social cognition task (DV, quasi-continuous). Participants are placed into either a timed or an untimed condition of the social cognition task...
  6. L

    scatter plots with 2 covariates. spss

    Hi, I have two independent variable (location and season), one dependent (number of juvenile whales) and two co-variates (number of adult whales and length of longest whale). I know I have to do a ANCOVA, but I need to produce a scatter plot to compare the slopes of regression.... How? is...
  7. A

    Help with which type of ANOVA to use?!

    Hello, I'm trying to figure out which type of ANOVA I'd use in this situation. My question involves 3 different groups with measurements taken at two different times (pre and post intervention). The data kind of looks like: Group 1: Pre: x, x, x, x, x, x, x, x, x, x Post: x, x, x, x, x, x, x...
  8. K

    Mechanical Engineer, four cavity mold, how many parts to test?

    My friend is a mechanical engineer at a company in CT. I was pretty good at stats back in my day so he asked me to solve this for him. This is a REAL question he is facing for his company/customers. There are 200(+- a few) parts in a bin. The parts were made from a four cavity mold. There...
  9. C

    which sampling methods-reply ASAP

    For some statistics course work, I am investigating two hypothesis', and I am not sure which sampling method I should use. They hypothesis' are: the accuracy of estimations of the size of an angle is more accurate when on white paper with black lines, and The accuracy of an estimation of the...
  10. K

    Properties of Sample Proportions

    A city council is considering drafting legislation related to the exclusion of renters with children. Since implementation will be expensive, they will only consider proceeding if the true proportion of apartments that prohibit children is more than 75 percent. Suppose that out of 125 sampled...
  11. K

    Please help!

    I cannot figure this question out for the life of me :( A game consists of tossing two coins, first a dime and then a nickel. For each coin which comes up a head you win the value of the coin. For each coin which comes up a tail you get nothing. I have gotten this so far - that the...
  12. T

    how to calculate adjusted standard error to report with adjusted means for ancova

    How to calculate adjusted mean and adjusted std error? I'm using regression as ancova in R as below. Condition is coded: 0 = control, and 1 = experimental. I understand that the intercept is the adjusted mean for the control and the intercept + condition coefficient is the adjusted...
  13. T

    How to calculate adjusted mean and adjusted std error using lm()

    I'm using regression as ancova as below. Condition is coded: 0 = control, and 1 = experimental. I understand that the intercept is the adjusted mean for the control and the intercept + raw condition coefficient is the adjusted mean for the experimental group. My question is, can i...
  14. 1

    Multiple Regression Analysis Issue

    Hi everyone I have just signed up! I am currently doing a thesis & struggling with my regression model. I am examining the link between profit levels debt levels in the oil and gas industry. My Dependent variable is Profitability, Independent variables are Debt/Size of company/Growth rate of...
  15. W

    Help on one sample repeated measures (>2 data points per subject)

    Dear members of Talk Stats forum: I come to you in the hope that you can point me in the right direction to explore. I am trying to find the appropriate statistical test for a one sample, repeated measure experiment. Basically, I am measuring variable A on each participant at seven time...
  16. S

    SAS programming help needed please!

    Hi, I am writing a SAS program that has too many IF THEN statements and it is getting overwhelmingly complicated. I am working with ages and placement of number of kids into "age buckets". Can you please take a look and try to figure out how to help with this (maybe with an array or a...
  17. A

    Repeated measure mixed models HELP PLEASE!!

    Hi to everyone! I am new to the forum! Very briefly, my problem is as follows: I started a research on videogame exposure and morality. I used exposure to videogames as IV and a measure of morality as DV. The scale used to measure morality has a 5 sub-scales. In a first step of...
  18. T

    SPSS MSc Research

    Hi, My research partner and I are currently carrying out some quantitative research and are struggling to use SPSS as we a new to the program... We've completed a fairly large-scale questionaire and have successfully collected our 430 responses, from 1600 questionnaires distributed, and...
  19. K

    Need help with this tricky average problem

    The senior citizen rowing club team is made out of 10 members. In order to compete they need to have an average age of more than 55 years; the problem is that members do not want to reveal their age, neither to know the age of the others, nor the minimum or the maximum. They find a way to do it...
  20. J

    Help--A basic linear regression problem

    This equations are come from a text book. I want to know that why (I-H)Xβ disappeared in the last formula. Thanks a lot.