1)    The arithmetic mean of a set of 8 numbers is 16. If each number is first multiplied by 3 and then decreased by 5, then what will be the mean of new numbers?

A) 48

B) 45

C) 43

D) 40

Original mean = 16

Number of terms = 8

Multiply each number by 3 → new mean = 

16×3=48

Decrease each number by 5 → subtract 5 from mean: 

48−5=43

Ans)   C) 43


2)   Which among the following characteristics is important in the case of an “experimental research”?

A) Generalization

B) Randomization

C) Manipulation of variable

D) None of these

Experimental research is defined by the intentional manipulation of the independent variable to observe its effect on the dependent variable under controlled conditions. Randomization (B) is a key feature of true experiments to control bias, but not all experimental designs (e.g., quasi-experimental) use it. Generalization (A) is a possible outcome of good research, not a defining characteristic. 

Ans)   C) Manipulation of variable