Share

## Matilda sits on her back porch for one hour every morning for a week and record the types and numbers of birds that viste her bird feeder wh

Question

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

Question

### What is the final amount if 777 is decreased by 12% followed by a 4% increase? Give your answer rounded to 2 DP.

### In a survey of 1,000 elders, 57% of them have been hospitalized before. Of those who have been hositalized before, 54% have insurance. Of th

### In Janie’s homeroom, 45% of the students’ families own a dog and 23% own a dog and a cat. What is the probability that a student’s family ow

### A motorist made a 60-mile trip averaging 20 miles per hour.On the return trip,he averaged 30 miles per hour.What was the motorist’s average

### The GCD(a, b) = 9, the LCM(a, b)=378. Find the least possible value of a+b

## Answers ( )

Observational study.

——APEX

Answer:## d.

Step-by-step explanation:The choices for this question are

a.Double-blind studyb.Experimentc.Sample surveyd.Observational studyThe right answer would be d. Observational study, because this type of study is defined as an empirical and non-experimental research where all information is obtained by observation. When we apply this study, we try to find a cause-effect relation by observing the phenomenon as it naturally happens, that is, without interfering with the course of events like experimental investigations do.

So, in this case, Matilda is just observing, without altering anything that could influence the birds. She just sits observe and recover information, that’s an observational study.

Therefore, the right answer is d.