Question

3.2.2 Question Help The brain volumes (cm) of 20 brains have a mean of 1188.7 cm and a standard deviation of 120.9 cm. Use the given standard deviation and the range rule of thumb to identify the limits separating values that are significantly low or significantly high. For such data, would a brain volume of 1420.5 cm be significantly high? Significantly low values are cm or lower. (Type an integer or a decimal. Do not round.)

Answer 1

Solution :

Given that ,

mean = $\mu$ = 1188.7

standard deviation = $\sigma$ = 120.9

significantly low value = $\mu$ - 2 $\sigma$

significantly low value = 1188.7 - 2 * 120.9

significantly low value = 946.9

significantly high value = $\mu$ + 2 $\sigma$

significantly high value = 1188.7 + 2 * 120.9

significantly high value = 1430.5