The estimated standard deviation is ________.

Question

Below are the range and standard deviation for a set of data. Use the range rule of thumb and compare it to the standard deviation listed below. Does the range rule of thumb produce an acceptable​ approximation? Suppose a researcher deems the approximation as acceptable if it has an error less than​ 15%.

Range		2.93
Standard Deviation		0.918

The estimated standard deviation is ________.

​(Round to three decimal places as​ needed.)

Answer 1

range rule of thumb is that range is four times the standard deviation.

the range/4 = 0.7325

error = 0.918 - 0.7325

-------------------- = 0.20 or 20%, so not acceptable.

0.918