Section 3.2 Homework

2.  The brain volumes ​(cm3​) of 50 brains vary from a low of 904 cm3 to a high of 1490

cm3. Use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 73.1 cm3​, assuming the estimate is accurate if it is within 15 cm3.

The estimated standard deviation is _____cm3

Compare the result to the exact standard deviation.

1. The approximation is accurate because the error of the range rule of​ thumb’s approximation isless than 15 cm3.
2. The approximation is accurate because the error of the range rule of​ thumb’s approximation isgreater than 15 cm3.
3. The approximation is not accurate because the error of the range rule of​ thumb’s approximation isgreater than 15 cm3.
4. The approximation is not accurate because the error of the range rule of​ thumb’s approximation is less than 15 cm3.