Question

select the correct answer from each drop-down menu.

a researcher is examining the claims made by a water softener salt manufacturer. he performs an experiment using water from a variety of sources. for each water source, he has a sample with no treatment and a sample treated with the recommended amount of the water softener salt.

he then tests each sample to measure the softness and compares the results, determining that the claims made by the manufacturer are true.

the conclusion drawn from the study is choose an answer because the sample is choose an answer. in this instance, an choose an answer study was performed.

Explanation:

Identify the study type

The researcher applies a treatment (water softener salt) to one group of water samples and compares it to an untreated control group of water samples. This active manipulation of an independent variable means an experimental study was performed.

Evaluate the validity of the conclusion

The conclusion drawn from the study is valid because the researcher used a controlled setup (comparing a treated sample directly with an untreated sample from the same variety of water sources), which allows for a direct comparison of the treatment's effect.

Determine sample characteristics

The sample is representative because the researcher gathered water from a variety of sources, ensuring the findings can be generalized to different types of water.

Answer:

The conclusion drawn from the study is <blank>valid</blank> because the sample is <blank>representative</blank>. In this instance, an <blank>experimental</blank> study was performed.