In each of the following instances (i) tell whether the study is experimental or

Question

In each of the following instances (i) tell whether the study is experimental or observational (ii) tell whether the study is comparative or descriptive, and (iii) the study is comparative, if identify the response and explanatory variables. Teenage students from suburban schools are interviewed to estimate the proportion with a gang affiliation. A study from hospital records found that women who had low weight gain during their pregnancy were more likely to have low birth weight babies than women who had high weight gains. A study monitors the occurrence of heart disease over a 5 year period in men randomized to eat high fiber or low fiber diets. Annual rates of return on investment are compared among different groups of mutual funds.

Explanation / Answer

( a )

This is an observational study.

This is a descriptive study.

(b)

This is an observational study.

This is a comparative study.

Here the response variable is weight of the babies and the explanatory variable is the weight gains of the mothers.

(c)

This is an experimental study.

This is a comparative study.

Here the response variable is heart disease in men and the explanatory variable is diet.

(d)

This is an observational study.

This is a comparative study.

Here the response variable is annual rates of returns and the explanatory variable is the different groups of mutual funds.

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

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