sample population

  1. L

    Sample size and probability hypothetical example

    Hi, I am trying to figure out a sample size for the following hypothetical example: Say there are 40 movie theaters in New York, 40 movie theaters in Los Angeles and 20 movie theaters in Miami. Each theater has 20 screens (rooms). So 100 theaters/2,000 screens total. Each theater will show a...
  2. M

    Calculate type 2 error using one data file

    I am a bit confused on how to calculate type 2 error to check whether the sample data I am using is sufficient. I have a data file that I have used to build a machine learning model. This data file consists of 500 entries describing information about entities and the funding these entities have...
  3. P

    How to select the training dataset

    I have a dataset which contains dependent variance Y and several independent variances X1, ... , X10. Y has 5 possible values: A, B, C, D, E, a proportion of each value is: A: 80%, B:10%, C:5%, D:3%, E:2%. I want to build a model to predict the value of Y, I decide to pick up 70% of the...
  4. U

    Help on Sample Distribution - Statistic for Business! =)

    I am currently solving this problem for next week presentation. My answer is super close to the correct answer, somehow I can't find the correct answer using my method. Question: In evaluating the customer satisfaction level, a company would like to be 95% confident that the error in...
  5. R

    Generalizability of results / External validity

    Hi everyone, Employment of probability sampling to draw a sample from the population in a quantitative study (cross-sectional design, data collected via surveys) is one of the criteria needed to make inferences to the population. What other criteria are in play? How to determine, where...
  6. G

    help for final dissertation in finance- very easy stat - URGENT! :-)

    Hi I am about finishing my thesis in finance but I don't remember anything about statistics and I need your help!! here is my issue: the topic of the thesis is "exit strategies of private equity funds in luxury goods company". The hypothesis is that, given 3 possible types of exits (trade...
  7. M

    How to select sample population for software test?

    Hi, We are running some software test on customer data. We usually use a sample of 50k customers out of 8m customers. We select customers that will be part of sample population based on different criteria, in order to cover different scenarios. The set of tests are the same for all the...