Determine whether the given description corresponds to an observational study or experiment
in a study of 418 students with a particular disease, the subjects were monitored with an eeg while asleep
does the given description correspond to an observational study or an experiment
a the given description corresponds to an observational study
b the given description corresponds to an experiment
c the given description does not provide enough information to answer the question

The answer is A) The given description corresponds to an observational study.

Step-by-step explanation:

We can know that is an observational study because the definition of a observational studies are where researchers observe the effect of a risk factor, diagnostic test, treatment or other intervention without trying to change who is or isn't exposed to it.

In this case the researches are just monitoring the sleep of the students without altering anything.

i = 2 / - 5

step-by-step explanation:

evaluation of ( 2 - 4 ) ( p + q ) when p = 2 and q = 5 i, by putting values of p and q,                                                                    

see explanation

step-by-step explanation:

since the sequence is geometric there is a common ratio r between consecutive terms, that is

r = 4 ÷ - 2 = - 2

r = - 8 ÷ 4 = - 2

r = 16 ÷ 8 = - 2

the next term - 13 must be incorrect as it should be - 32 for the sequence to be geometric.

the first 4 terms are therefore geometric with common ratio r = - 2