Students in a large statistics class were randomly divided into two groups. the first group took the midterm exam with soft music playing in the background, and the second group took the exam with no music playing. after the exam was completed, a researcher compared deidentified exam scores of the two groups. which of the following is the reason this experiment was not blind? a. the sample sizes in both groups was large. b. the students knew whether or not music was playing while they were taking the exam. c. students were randomized into the two groups. d. some of the students may not have studied for the exam. e. researchers looked at exam scores for the two groups.

2. angles qrt and qst both measures 156 degrees.

step-by-step explanation:  

we have been given a diagram of a circle and we are told that measure of arc qvt is 156 degrees.  

we can see from our given diagram that angle qrt and angle qst subtends to arc qvt.

since we know that angles subtended by the same arc at the circumference are always equal.

by angle subtended by same arc theorem, measure of angle qrt and angle qst will be equal to the measure of arc qvt.

therefore, angles qrt and qst both measures 156 degrees and 2nd statement is the correct choice.

step-by-step explanation:

given that ab is divided into equal parts as

ac, cd, de, ef, fg, gh, hi, ib.

from this we find that f is the midpoint of ab.

so using mid point formula we find

f = (3,7)

similarly considering fb, we get

h = mid point of fb = ((6,6) and g, mid point of fh is

g = (9/2, 13/2)

i is mid point of hb

so i =(15/2,11/2)

isn't it a pentagon? sense [3 (triangle) + 4 (rectangle)] - 2 (triangle and rectangle connected) = 5 (pentagon)