Questions: You wonder whether green tea lowers cholesterol. Complete parts (a) through (h) below. (a) To research the claim that green tea lowers LDL (so-called bad) cholesterol, you ask a random sample of individuals to divulge whether they are regular green tea users or not. You also obtain their LDL cholesterol levels. Finally, you compare the LDL cholesterol levels of the green tea drinkers to those of the non-green tea drinkers. Explain why this is an observational study. A. This is an observational study because the researcher is manipulating the explanatory variable, LDL cholesterol levels. B. This is an observational study because there is no intent to manipulate the explanatory variable, whether the individual is a green tea drinker or not. C. This is an observational study because the researcher is manipulating the explanatory variable, whether the individual is a green tea drinker or not. D. This is an observational study because there is no intent to manipulate the explanatory variable, LDL cholesterol levels.

You wonder whether green tea lowers cholesterol. Complete parts (a) through (h) below. (a) To research the claim that green tea lowers LDL (so-called bad) cholesterol, you ask a random sample of individuals to divulge whether they are regular green tea users or not. You also obtain their LDL cholesterol levels. Finally, you compare the LDL cholesterol levels of the green tea drinkers to those of the non-green tea drinkers. Explain why this is an observational study. A. This is an observational study because the researcher is manipulating the explanatory variable, LDL cholesterol levels. B. This is an observational study because there is no intent to manipulate the explanatory variable, whether the individual is a green tea drinker or not. C. This is an observational study because the researcher is manipulating the explanatory variable, whether the individual is a green tea drinker or not. D. This is an observational study because there is no intent to manipulate the explanatory variable, LDL cholesterol levels.
Transcript text: You wonder whether green tea lowers cholesterol. Complete parts $(\mathrm{a})$ through ( h ) below. (a) To research the claim that green tea lowers LDL (so-called bad) cholesterol, you ask a random sample of individuals to divulge whether they are regular green tea users or not. You also obtain their LDL cholesterol levels. Finally, you compare the LDL cholesterol levels of the green tea drinkers to those of the non-green tea drinkers. Explain why this is an observational study. A. This is an observational study because the researcher is manipulating the explanatory variable, LDL cholesterol levels. B. This is an observational study because there is no intent to manipulate the explanatory variable, whether the individual is a green tea drinker or not. C. This is an observational study because the researcher is manipulating the explanatory variable, whether the individual is a green tea drinker or not. D. This is an observational study because there is no intent to manipulate the explanatory variable, LDL cholesterol levels.
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Solution

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Solution Steps

Solution Approach

To determine whether the study is observational, we need to check if the researcher is manipulating any variables. In this case, the researcher is simply observing and recording whether individuals are green tea drinkers and their corresponding LDL cholesterol levels without any intervention or manipulation. Therefore, the correct answer is the one that states there is no intent to manipulate the explanatory variable, which is whether the individual is a green tea drinker or not.

Step 1: Identify the Type of Study

To determine whether the study is observational, we need to check if the researcher is manipulating any variables. In this case, the researcher is simply observing and recording whether individuals are green tea drinkers and their corresponding LDL cholesterol levels without any intervention or manipulation.

Step 2: Determine the Explanatory Variable

The explanatory variable in this study is whether the individual is a green tea drinker or not.

Step 3: Determine the Nature of the Study

Since there is no intent to manipulate the explanatory variable (whether the individual is a green tea drinker or not), this study is classified as an observational study.

Final Answer

\(\boxed{\text{B}}\)

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