question: 16\nashley wants to know whether a ...
question: 16\nashley wants to know whether a persons arm span is approximately equal to his or her height. she randomly samples 30 classmates and takes their measurements. this is an example of \na. an experiment\nb. a sample survey\nc. an observational study\nd. a random phenomenon
Answer
# Brief Explanations:
In an observational study, researchers observe and measure characteristics of a sample without trying to influence or manipulate the variables. Ashley is simply taking measurements of her classmates' arm - spans and heights without any intervention or treatment. It's not an experiment as there is no manipulation of variables. A sample survey usually involves asking questions rather than taking physical measurements. And it's not a random phenomenon as she is deliberately collecting data for a specific purpose.
# Answer:
C. an observational study