statistics

  1. J

    How to solve? Distribution of Sample Mean - Textbook Problem

    The solution is 0.7720, but I am unsure how to get it. I interpret the problem as asking for the probably that the sample mean of the two samples is <= 11. I know how to find the probably for one sample mean, but confused how to find it for two.
  2. M

    t test or ANOVA for my survey results?

    Hi all. I ran a survey where I showed 2 ads to men and women in 5 different countries to see which they preferred. I want to know if gender or country influenced the selection of a particular ad preference. The data is normal. I was told to use a One-way ANOVA but I don't think this is correct...
  3. J

    What test should I use ? comparing pre/post treatment 3 level categorical data

    What test should I use to compare pre/post treatment effect in the form of categorical outcome ? Post treatment groups have shown decrease in the no. of pads used, what test is most suitable for this scenario? (files attached) Thanks a lot !
  4. I

    Cross-national comparison best methodology and research questions advice

    I am working on my master thesis based on European Social Survey Round 9 from 2018 (link). In a nutshell, I want to use justice principles (the ESS Round 9 is meant to measure four different distributive justice principles, link) to investigate the differences in justice principles between...
  5. I

    How to test likelihood hypothesis on dataset?

    How to test the following hypothesis? Customers with larger fares are more likely to be travailing alone than smaller ones. Using the data below, is a common statistical test appropriate for this hypothesis? Given were comparing different segments(high vs low) of fare, surely tests using means...
  6. N

    Unbiasedness of the Variance of the Error Term in an intercept-only Model

    Hi folks, Is there anyone that might help me with the following derivation to show that the estimated variance error term is unbiased? I have managed to do the first and the second step, however I am currently stuck at the third step since I don't know how to replace Yi by µ^. The model itself...
  7. H

    How to perform one-way ANOVA in the following question

    Unsure what log transforming is, and I am confused regarding how to perform such a complex ANOVA, perhaps I am overthinking... Any suggestions welcomed :) If you need further context please let me know and I will do my best to include some. Thanks for taking the time to read this post.
  8. M

    Where to start..?

    I am currently carrying out research on A&E attendance for my surgical speciality pre and post covid. I have collected data from around 3000 attendances, and have been staring at the data for two months now, unsure of how to progress. The aim is to see whether the lockdown had an affect on a)...
  9. J

    Null Hypothesis

    One of the biggest issues facing e-retailers is the ability to turn browsers into buyers. This is measured by the conversion rate, the percentage of browsers who buy something in their visit to a site. The conversion rate for a company's website was 10.1%. The website at the company was...
  10. D

    Big data analysis - What statistical method should I use?

    I am currently working on my master thesis that is investigating textual factors of "viral headlines". My professor gave me a data set for R that contains about 4.000 packages. Each package has about 3 -5 different headlines of the same article, and their resulting click rate. Somewhat like an...
  11. S

    What are the types of statistical tests/analysis which I can do here ?

    Dear All, I am writing my Master Thesis on the concept of 4-day work week...this is about how employees instead of working 5 days a week...work only for 4 days a week...since the concept is relatively new..mine is an exploratory study... In this study there are three parts - Part 1 - I cover...
  12. S

    What tests to carry out when all variables are categorical?

    Hello to one and all, I am doing a Research Project for my Master degree course. One of my Research Questions in my Project is: How do employees in <”name of country”> perceive the concept of <”an upcoming concept related to how employees work”> ? I need to take a survey in order to answer the...
  13. A

    Comparing the mean of two tests within subjects with different scores

    Hi, I need to analyse these data in which I basically have the same subjects doing -the first half of the test in condition A with a score from 0 to 3 -the second half of the test in condition B with a score from 0 to 12. I cannot make them equal because the second scoring system allows a...
  14. Y

    How do you start solving a statistical problem? Topic - Goodness of fit criteria.

    At the university, I was given the following task in statistics in topic Goodness of fit (and probability): Previously, people often used tables of random numbers (for example, when they did not have access to a computer with the necessary statistical software). Such tables can be found in...
  15. M

    Statistical test for app

    The tool I'm building will show two (or more images) to an audience of 100 people. The audience will select one of the options. For the customers of the tool, I want to be able to tell them something such as "Option A was chosen x% more than Option B. With 95% certainty, Option A is your better...
  16. W

    Normalizing traits/statistics based on trait count for each trait type

    My goal is to create an app that calculates rarity scores of traits. The rarity score is a formula like so: Rarity score = 1/(%Chance Of occurrence) Let's say I have a trait that has 10% chance of occurring. The rarity score for this trait will be: 10 = 1/(10%). This score will be without...
  17. R

    Is the difference between two groups bigger, then x2 value bigger and p value smaller?

    For chi-square test or other tests involving x2 and p value, is it true that if the difference between two groups is bigger, then x2 value is bigger and p value is smaller?
  18. A

    Unequal sample size of 2 groups data. Will it affect the ANOVA result?

    Hi All, I have a doubt. I have a dataset attached in the below image. I am doing ANOVA on the dataset to findout Dosage have a significant effect on Injected_timing. But I have unequal data(For person1 , there is 2 morning and 1 evening data. For person2, there is 2 morning and 1 evening...
  19. P

    trying to find the probability of a certain price in the oil market being touched within a time frame

    I have built a model that predicts closing prices of the oil market. My goal is to make a model that can help find the probability of reaching a certain price within a certain time frame but I am lost. For example, if oil is at 60.00 a barrel, I would like to know how to find the probability of...
  20. B

    'not randomly generated' what does the even mean?!?

    As expressed in this question: The telephone numbers for a region of a state have an area code of 570. The next seven digits represent the local telephone numbers for that region. A local telephone number cannot begin with a 0 or 1. Your cousin lives within the given area code. What is the...