Question

need help answering these questions please

The brain volumes (cm) of 20 brains have a mean of 1086.3 cm. and a standard deviation of 126.8 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 1299.9 cmbe significantly high? Significantly low values are cm or lower. (Type an integer or a decimal. Do not round.) Significantly high values are cm or higher (Type an integer or a decimal. Do not round.) Is 1299.9 cm significantly high? O A. No, because it is between the limits separating values OB. No, because it is below the lower limit separating value OC. Yes, because it is below the lower limit separating value OD. Yes, because it is between the limits separating values O E. No, because it is above the upper limit separating value OF Yos, because it is above the upper limit separating value

Answer 1

3 Given that mean CW JE108 6.3 cm standard deviation is = 126.8 cm3 range rule are The rule of thumb indicates that the 2 usual values. within standard deviation from the mean. ic. Significantly low values Te. 1686.3 2x 126.8 - 1686.3-253-6 = 832.7 are X-25 cm3 :. Significantly low values are 832.7 cm3 or lower and significanly high values. are a +25 = 1086.3+2 x 126.8 1339.9 cm3 significantly high values are 1339,9 cm3 higher. ar then Since 1299.9 m² i die between 832.2 em and 1339. 9 cm3 gs 1299.9 em? significantly high- Yes because between the limit separating Nalues it is