Researchers measured the cholesterol levels in mg per 100 mL for 52 participants

Question

Researchers measured the cholesterol levels in mg per 100 mL for 52 participants. The participants were randomly selected from two age groups: under 50 years, or 50+ years

1. What is the variable of interest being measured?

2. What type of sampling method is being used here?

3. Are there any possible confounding variables, or other sources of variability?

The 52 participants are asked to change their diet to measure the effect it may have on lowering cholesterol levels. The researchers performing the study offer two dietary options: (1) a diet low in saturated fat, and (2) a diet low in sugar. The participants in the study may chose which diet they prefer to follow. Their cholesterol levels after dieting are recorded on the page labeled Histogram.

4. What type of study is this?

5. What is wrong with the design of this study?

Explanation / Answer

Answer:

Researchers measured the cholesterol levels in mg per 100 mL for 52 participants. The participants were randomly selected from two age groups: under 50 years, or 50+ years

1. What is the variable of interest being measured?

Variable of interest: cholesterol level

2. What type of sampling method is being used here?

Random sampling.

3. Are there any possible confounding variables, or other sources of variability?

Possible confounding variables may be exercise, food type.

The 52 participants are asked to change their diet to measure the effect it may have on lowering cholesterol levels. The researchers performing the study offer two dietary options: (1) a diet low in saturated fat, and (2) a diet low in sugar. The participants in the study may chose which diet they prefer to follow. Their cholesterol levels after dieting are recorded on the page labeled Histogram.

4. What type of study is this?

Experimental study ( there is intervention on the subjects)

5. What is wrong with the design of this study?

The subjects are not randomly allotted to the groups. Self selection bias is present and is a causing a biased sample

Related Questions

Navigate

• Browse (All)
• Browse R
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.