Question

Researchers at the Medical College of Wisconsin studied 2,121 children between the ages of 1 and 4.† For each child in the study, a measure of iron deficiency and the length of time the child was bottle-fed were recorded. The resulting data were used to learn about whether there was a relationship between iron deficiency and the length of time a child is bottle-fed.

T, Type of Data: One variable or two? Categorical or numerical?

a. one categorical variable

b. one numerical variable    

c. two categorical variables

d. two numerical variables

N, Number of Samples or Treatments: How many samples or treatments?

a. one sample

b. one treatment    

c. two samples

d. two treatments

Answer 1

Solution:

In the given study there are two variables. One is iron deficiency and other is length of time a child is bottle-fed.

Since, both of the measure of iron deficiency and length of time a child is bottle-fed, can be measured numerically, therefore we have two numerical variables.

Since in the study for each child a measure of iron deficiency and the length of time the child was bottle-fed were recorded therefore, we can say that there is only one sample which consists of 2121 children.

Hence, we have one sample.