A researcher records the time (in seconds)it takes a sample of participants to walk alone through a dark portion of campus.The researcher computes SS = 1,200.Assuming that a sample of 25 participants was observed in this study,what is the standard deviation for these data?
A) 48 s
B) 50 s
C) 6.9 s
D) 7.1 s

Question

Quizplus · Accepted Answer

To calculate the standard deviation, we first need to find the variance:

Variance (s^2) = SS / (n-1)
Variance (s^2) = 1200 / 24
Variance (s^2) = 50

Then the standard deviation:

Standard deviation (s) = √variance
Standard deviation (s) = √50
Standard deviation (s) = 7.1 seconds

Therefore, the correct answer is D) 7.1 s.

A Researcher Records the Time (In Seconds)it Takes a Sample