1. The problem statement, all variables and given/known data Hello, I was given 2 sets of data, showing 20 temperature values and 35 temperature values respectively. The data sets look like below: Data 1 Data 2 Temperature Temperature 30.9 28.5 30.6 30.4 .. .. continued (20 values) continued (35 values) I have done the Chi-squared test for these two sets of data. However, I am also required to analyse the third case, where no data is provided. It was only given that the third dataset consists of 66 data points (and within the limits of any random effects matches the characteristics of datasets 1 and 2) and I need to suggest the number of Chi-squared groups for the third dataset. I want to ask what the best way is to determine the number of Chi-squared groups for specific number of data points (in this case 66). 2. Relevant equations 3. The attempt at a solution For the first and second sets of data, I simply separated the values by 5 points, so 4 groups for the first set and 7 for the second.