10 Matching Annotations
  1. Mar 2023
    1. Some people argue that the Welch’s t-test should be the default choice for comparing the means of two independent groups since it performs better than the Student’s t-test when sample sizes and variances are unequal between groups, and it gives identical results when sample sizes are variances are equal. In practice, when you are comparing the means of two groups it’s unlikely that the standard deviations for each group will be identical. This makes it a good idea to just always use Welch’s t-test, so that you don’t have to make any assumptions about equal variances.
  2. Jan 2023
  3. www.investopedia.com www.investopedia.com
    1. T-Test: What It Is With Multiple Formulas and When To Use Them

      https://www.investopedia.com/terms/t/t-test.asp A t-test is an inferential statistic used to determine if there is a significant difference between the means of two groups and how they are related. T-tests are used when the data sets follow a normal distribution and have unknown variances, like the data set recorded from flipping a coin 100 times.

  4. Apr 2022
    1. In this case, for a test to be statistically significant, p-value must be lower than 0.05.

      statistical significance should be less than 5%

      tf your confidence that the results are not due to chance is 95%

    1. We are 99% confident that the true average “attitude” difference betweenliving environments is between 1.32 and 7.88. At a significance level of 0.01we can say that living in a minority environment is associated with higherscore

      99% confident that the true average (result) is between these two numbers;

      at 1% (0.01) significance, we can scientifically assume there is a causal relationship

  5. Jan 2022
  6. Feb 2021
  7. Dec 2020
  8. www.investopedia.com www.investopedia.com
    1. Essentially, a t-test allows us to compare the average values of the two data sets and determine if they came from the same population.

      Comparing datasets to see if they came from the same population.

  9. Oct 2020