A sample of n = 25 scores has M = 20 and s2 = 9. What is the sample standard deviation?
a. 3
b. 4.5
c. 9
d. 81
S^2 = 9
s = 3
Ans a
To calculate the sample standard deviation, we need to use the formula:
s = √(s^2)
Where s is the sample standard deviation and s^2 is the sample variance.
Given that s^2 = 9, we can substitute this value into the formula:
s = √(9)
Taking the square root of 9 gives us:
s = 3
Therefore, the sample standard deviation is 3.
So the correct answer is: a. 3
To find the sample standard deviation, we use the formula:
σ = √(s^2)
where s^2 is the sample variance.
Given that s^2 = 9, we can calculate the sample standard deviation:
σ = √(9) = 3
Therefore, the correct answer is a. 3.