Speeds for a randomly selected sample of n = 36 vehicles will be recorded. Determine the values that fill in the blanks in the following sentence. For samples of n = 36 vehicles, there is

Question

Speeds for a randomly selected sample of n = 36 vehicles will be recorded. Determine the values that fill in the blanks in the following sentence. For samples of n = 36 vehicles, there is 
about a 95% chance that the mean vehicle speed will be between ___ and ___.

PsyDAG · Answer

What is the mean and standard deviation for the sample?

Z = (score-mean)/SEm

SEm = SD/√n

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion (±.425) related to the Z score.