You have collected data about the average response time of participants in your study. You are delighted to find that the variable is normally distributed. If the mean response time is 12 seconds and the standard deviation is 4 seconds what percent of your subjects would you expect to respond in 4-20 seconds?
A) 50%
B) 68%
C) 95%
D) Unable to determine

Question

Quizplus · Accepted Answer

The range 4-20 seconds is within two standard deviations (mean ± 2*SD) of the mean in a normal distribution, which covers approximately 95% of the data.

You Have Collected Data About the Average Response Time of Participants