Answer:
(a)- C.This was a case-control study because individuals that had a certain characteristic were matched with those that did not.
(b)- C.The response variable is whether the woman has IDC breast cancer or not. The response variable is qualitative.
(c)- C.The explanatory variable is consumption of Granny Smith apples.
(d)- D.The researchers were sure that various demographic and lifestyle variables had greater influence than daily consumption of two or more servings.
Step-by-step explanation:
In Cohort study the whole population is divided into small groups.
In the Cross-Sectional Study, we work on the sample ( a subset of the population) at a specific point of time.
In a case-control study, we keep all other factors constant except the variable we have to study.
Here all other factors like age, sugar patient, B.P. patients are kept constant.
Thus option (c) is correct.
The variable that we can change is called the Explanatory Variable.
The Response variable depends upon the explanatory variable, as we change the value of the explanatory variable the value of the response variable is also get changed.
When the data is in the form of numeric, it is called quantitative.
When the data is not in the numeric form, it is called qualitative.
Here in this study Researcher wants to determine the association between daily apple consumption and the occurrence of breast cancer.
So, the Occurrence of breast cancer depends on apple-eating habits.
Thus, Response Variable is Occurrence of breast Cancer
and, Explanatory Variable is apple-eating habits.
Thus, In (b) Option (C) is correct i.e. The response variable is whether the woman has IDC breast cancer or not. The response variable is qualitative.
In (c) Option (C) is correct i.e. The explanatory variable is the consumption of Granny Smith apples.
In (d) Option (D) is correct. i.e.The researchers were sure that various demographic and lifestyle variables had greater influence than the daily consumption of two or more servings.
