A researcher has collected some data on the amount of time in seconds (to the nearest 0.1 second) that it took trained rats to run through a maze. The data is shown below arranged in a frequency distribution of grouped scores. The real limits of the interval 6.4-6.7 are _________.
A) 6.3-6.8
B) 6.4-6.7
C) 6.35-6.75
D) 6.45-6.75

Question

A researcher has collected some data on the amount of time in seconds (to the nearest 0.1 second) that it took trained rats to run through a maze. The data is shown below arranged in a frequency distribution of grouped scores.  The real limits of the interval 6.4-6.7 are _________.
A) 6.3-6.8 
B) 6.4-6.7 
C) 6.35-6.75 
D) 6.45-6.75

Quizplus · Accepted Answer

The real limits of an interval are found by subtracting 0.05 from the lower limit and adding 0.05 to the upper limit. Thus, for the interval 6.4-6.7, the real limits are 6.35-6.75. Therefore, the best choice is C.

A Researcher Has Collected Some Data on the Amount of Time