Does daily caffeine intake make subjects better at memory tasks?
A study was conducted in which the daily habits of 40 college students were documented, focusing on how much caffeine they consumed in a week. After a week, the subjects were given a computer-based memory test on which they received a score on a 0 to 100 point scale. Their scores were compared with how much caffeine they consumed that week.

The result of the test shows that;

1. This is best described as an observational study.

2. The explanatory variable is the amount of caffeine consumed.

3. The response variable is the score on the computer-based memory test.

Explanation:

An observational study draws its results from a sample to a population where the independent variable is not under the control of the researcher because of ethical concerns.

A. This is best described as an observational study.

B. The explanatory variable is the amount of caffeine consumed.

E. The response variable is the score on the computer-based memory test

Explanation:

A. Observational study can be defined as the way a person or people are observe.

The observational study often attempt to understand the relationship between the cause and effect in order to help measure certain outcomes. According to the case study the incident is best described as an OBSERVATIONAL STUDY

B.An explanatory variable can be defined as the variable that are not dependent in which another variable cannot affect it.

And this independent variable can often be used to help analyse the effect on another variable which is why the EXPLORATORY STUDY is the amount of caffeine consumed.

C. Response Variable can be defined as the variable which depend on other variables and this response variables help to provide the result or outcomes that will be used as the evidence of the effect of the caffeine

Which is why the RESPONSE VARIABLE is the score of the computer based memory test which will serve as the evidence of the effect of caffeine and it effect on their scores which is why their scores were compared with how much caffeine they consumed that week.

the median of the data is 4.

step-by-step explanation:

the median means the middle number of a given number.

to decide which one is the median, arrange in ascending or descending order. but sometimes, you may find two(2) number in the middle, but it's easy, just add them together and divide by 2.

so,   determine the median of the data. 2, 3, 3, 4, 5, 7, 9

it is already arranged, count 3 times forward and 3 backward and the one left is your answer.

2,3,3,4,5,7,9

our answer is 4.

hope this !