Aresearcher believes different types of music increase mental ability. so, the researcher has groups of participants complete a few puzzles. she times the group and grades their performance. she waits an hour and has them complete similar puzzles and again records their time and performance. she experiments by playing different types of music during the second testing to see if their improvement is more significant with certain types of music. how would you describe the type of music she plays?

a independent variable (treatment variable)

b dependent variable (variable of interest)

c confounding variable

d random variable

Independent Variable (Treatment Variable)  

*100% CORRECT ANSWERS

Question 1

A researcher believes different types of music increase mental ability. So, the researcher has groups of participants complete a few puzzles. She times the group and grades their performance. She waits an hour and has them complete similar puzzles and again records their time and performance. She experiments by playing different types of music during the second testing to see if their improvement is more significant with certain types of music.  

How would you describe the type of music she plays?

 Independent Variable (Treatment Variable)  

Question 2

Which type of study best describes the following research most likely to be done?  

A researcher is testing new weight loss supplements. The researcher decides to sample two groups. The first group of subjects, the researcher labeled group 'A'. The researcher plans to give a placebo that looks like the real medicine but is just a sugar pill to Group 'A'. The second group, group 'B', will be given the real medicine. The researcher knows which participants got the placebo and which received treatment but the participants don't know.  

 Blind Study  

Question 3

A person is studying a new headache medicine that has been deemed safe for human trials. The researcher offers the new medicine to people suffering from headaches at several local hospitals. The researcher has decided to use a blind study and form 2 sample groups. He gives patients in Group A the actual real experimental medicine. He gives patients in Group B a fake treatment that is nothing more than a sugar pill that looks like the real medicine.  

How would you describe Group B?  

Placebo Group

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have