The mean is the average value of the sample. The mean is calculated by dividing the sum of all values x(i) in the sample by n, the number of values in the sample.
Example: we have collected the age of 15 men and 14 women as follows:
Conclusion: the average man in our sample is younger than our average women
Run a Similarity test to see if you can infer that the entire populations are actually different, based on these samples
- Men: 18, 19, 23, 25, 30, 30, 35, 36, 39, 45, 54, 66, 66, 66, 74
- Women: 19, 19, 24,
29, 37, 39, 48, 57, 69, 70, 72, 75, 82, 83
(tip: it’s a good idea to list the values from low to high)
- Mean(men) = (sum of all values) / (number of values) = 626/15 = 41.7 yrs
- Mean(women) = 723/14 = 51.6 yrs
Conclusion: the average man in our sample is younger than our average women
Run a Similarity test to see if you can infer that the entire populations are actually different, based on these samples