A personal trainer who keeps records of all his clients' exercises would like to determine the change in the amount of weight that clients can curl with their arms and compare that to the change in the amount of weight they can squat with their legs after using the recommended program. He selects a random sample of 20 of his clients and separates the change in curl amounts into one sample and the change in squat amounts into a second sample. Are these independent samples?

Select the correct answer below:

Yes, these are independent samples.

No, these are not independent samples because the clients in both samples are not randomly selected.

No, these are not independent samples because the same clients are used for both samples.

Not enough information is provided to determine independence.