**question 1\.\** the data were gathered by the following procedure, reported in the study. "between january and june 1998, parents of children aged 2-16 years that were seen as outpatients in a university pediatric ophthalmology clinic completed a questionnaire on the child’s light exposure both at present and before the age of 2 years." was this study observational, or was it a controlled experiment? explain.

OBSERVATIONAL

Step-by-step explanation:

Let`s see the two kind of experiments mentioned:

In this case, the patient's parent only answer a questionnairewith no intervention from the doctors into the pacients at all, so it's an observational  experiment

the best buy, is the 4- kilogram bag of lollipops for $18.40.

step-by-step explanation:

i found my answer by dividing the cost of each bag by their respective weights.

14.88 divided by 2 = 7.44

17.29 divided by 3 = 5.77

18.4 divided by 4 = 4.6

24.4 divided by 5 = 4.88

by this, i found that the 4 kilo bag is the best buy.