Apretest of knowledge about microcomputers is given to a group of students 5 min prior to a filnm on the subject. a posttest given 10 min after the film showed a 10-point gain from the pretest. the researcher concludes that the film produced the gain. which of the following is likely the threat to internal validity?

a. statestical regression
b. selection bias
c, testing
d. maturation

b

step-by-step explanation:

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.