Independent vs dependent sampling The following pairs of samples are going to be
ID: 3238779 • Letter: I
Question
Independent vs dependent sampling
The following pairs of samples are going to be tested to see if there could be a difference between the population means. For each, determine if the samples are independent or dependent.
1) A researcher wants to determine if the average HGA1C reading changes, so he uses 12 randomly selected diabetic patients and records the readings for each patient before the starting medication and after 90 days of medication.
2) A researcher wants to determine if there is a difference in the amount of calories between French Vanilla Lattes and Chai Lattes served at a local coffee shop. A sample of 40 of each was used and the number of calories was recorded.
Explanation / Answer
Solution:-
1) A researcher wants to determine if the average HGA1C reading changes, so he uses 12 randomly selected diabetic patients and records the readings for each patient before the starting medication and after 90 days of medication. Dependent sample.
In this test, the both the sample are taken from the same population, before and after medication.
2) A researcher wants to determine if there is a difference in the amount of calories between French Vanilla Lattes and Chai Lattes served at a local coffee shop. A sample of 40 of each was used and the number of calories was recorded. Independent sample
In this test, the both the sample are taken from different population and two population are not paired to each other, hence they are independent sample.