1. S

    Sampling Distribution Problem

    Roll a dice five times. Record the results in Sample 1. Repeat the experiment for Sample 2, 3, and 4. In a live classroom setting, actual survey data is used. In this knowledge check online environment, please use the following data: Sample 1 Sample 2 Sample 3 Sample 4 2 4...
  2. E

    Analysis for difference in variances between group?

    I have data for 100 different biomarkers. Each biomarker has data for 4 groups (A,B,C,D) with ~2000 observations in each group. I've read a lot about ANOVA but I'm not looking for a difference in means, only a difference in variances between the 4 groups, for each biomarker. I know there is the...
  3. R

    Which Statistical test is it?

    Any chance anyone knows the answer to this? I know it's not paired t-test but don't know which of the others it is A hotel manager would like to test whether the average time taken for customers to complete the hotel's online booking form is less than 5 minutes. She selects a sample of 40...
  4. D

    The proportion of twitter followers of handle X also following Y

    OK, someone recently asked me what the probability that followers of Twitter handle X are also followers of Twitter handle Y. I used some R code (using the twitteR package) to get 47,000 followers from X and 61,000 followers of Y (the two handles have a LOT of followers). I created a vector and...
  5. J

    joint probability

    I am not really sure how to calculate question C. Can anyone help me out? Thanks in advance!
  6. A

    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...
  7. Y

    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...
  8. E

    multi label problem

    Hi everyone, I'm currently working on my master dissertation. It is about the adoption of new products (COCA COLA PRODUCS). These are 26 new products. I need to determine which makes a foodservice business adopt the new products. I also have variables, such as environment of the business...
  9. S

    Financial Statistics

    I am looking to create some useful statistics for the company I work for. I posted another question with a similar format for a specific regression analysis question, however, this question is different. I have a dataset that includes company name, company type, service provided, charge for the...
  10. S

    one way ANOVA or paired t test?

    Apologies if this is a basic question, but my stats is very rusty these days! Background: I'm looking at a procedure that automates FISH analysis in a genetics diagnostics laboratory. I am currently running 7 patients that are negative controls (known normal patients) on the automated system to...
  11. S

    Data Science Consulting Jobs

    Hi all, STATWORX is a data science and statistics consulting company, located in Frankfurt Germany. Currently, we are looking for entry level and experienced data scientists. You can find our job offerings in our data science consulting page (German language). Feel free to apply to any of our...
  12. D

    Need help with a theoretical question

    Here is the question: How does the return distribution relate to the normal distribution if the return horizon becomes longer? :yup:
  13. V

    Books for Stats

    Hi All I am doing the MBA program. We have stats in our syllabus. I have strong mathematics background, however, I am not finding enough books to practice stats from. The questions we get aren't direct. We always get questions with a data set, which we solve using Excel/Data...
  14. B


    Please please help me! Hello there :) It's probably really straight forward but I'm having a very hard time trying to find a relationship between variables. I have an variable (Self-esteem) and I'm trying to assess whether there is a causal relationship between low self-esteem and if they...
  15. S

    URGENT! Reviewing SPSS output

    Hi guys, I'm needing help with figuring out my results for logistic regression, I have to get this in to my supervisor in 6 hours and I'm freaking out! I'm sure it'd be easy as pie for someone who knows the basics.. I've never been good with statistics, if anyone is willing to help can you...
  16. R

    Help regarding th topic: Shrinkage Precision Matrix Estimation with Application

    'Shrinkage Precision Matrix Estimation with Applications to Beamforming' or 'Shrinkage Estimation Precision Matrix with Applications to Beamforming'. I need help urgent regarding this topic. Any help like resources, references or how to solve this topic assignment please provide.
  17. F

    I need some help for my thesis about t-testing different data sets

    Hello everybody, I'm conducting research on price dispersion to show that offline price dispersion is significantly smaller than online price disperison. I have up until today, monitored and collected over 1500 prices in excel on several homogeneous products in...
  18. S

    Analyzing Tagged Content: Is a Multiple Regression Analysis the Right Approach?

    I’m working with a relatively small data set that consists of several hundred social media posts, key engagement metrics and up to 10 content “tags” that describe the image of each post. We leveraged Google Vision API along with a manual review to construct the tags. I’ve linked to an example of...
  19. W

    ANOVA? Looking at percentage habitat use (6 different habitats) across four seasons

    Hi, I am trying to look at whether habitat use of 6 different habitat types differs across 4 seasons. I have managed to run ANOVA tests but I'm not convinced this is correct. The code I have been using is as follows; an.aov=aov(Month~Heathland) an.aov summary(an.aov)...
  20. S

    stat questions on multicollinearity

    I'm working through some practice on regression analysis and wanted to confirm. My attempt is below. Thanks (1) The correlation between two orthogonal predictor variables is: a. 1.0 b. 0.0 c. 0.5 d. Correlation does not exist. (2) Consider a regression model with predictor...