Answer: The sample mean is more than the population mean by 3.5
=======================================================
Explanation:
To get the population mean, first add up all the population values
4+6+7+11+12+18+26+23+14+31+22+12 = 186
Then divide that over 12 as there are 12 values in the population
186/12 = 15.5
The population mean is 15.5
----------
The sample mean is computed the same way
add the values = 11+31+22+12 = 76
Divide the sum by 4 = 76/4 = 19
The sample mean is 19
The sample mean is larger by 19 - 15.5 = 3.5
