Question
Mathematics Question on Standard deviation
A random sample of size 9 has 21 as sample mean. The sum of the squares of the deviations taken from mean is 72. The sample is drawn from the population having 23 as mean. The value of test statistic is,
A
-2
B
2
C
-2.5
D
-3
Answer
-2
Explanation
Solution
The correct option is (A):-2