A researcher records the following times (in seconds)that it took a group of mice to complete a maze: 23 ± 4.1 (M ± SD).The top 10% of mice finishing with the fastest times will be placed in a "maze bright" group.What is the cutoff time to be placed in this group?
A) 17.75 s
B) 28.25 s
C) faster than 16 s
D) There is not enough information to answer this question.

Question

Quizplus · Accepted Answer

To find the cutoff time for the top 10% of mice, we first need to calculate the z-score for 10% (or 0.10) using a standard normal distribution table or calculator. The z-score for 10% is approximately 1.28.

Then, we can use the formula: 
cutoff time = mean + (z-score * SD) 
cutoff time = 23 + (1.28 * 4.1) 
cutoff time ≈ 28.25 s

Therefore, the cutoff time to be placed in the "maze bright" group is 28.25 seconds.

A Researcher Records the Following Times (In Seconds)that It Took