Question

The brain volumes (cm cubed) of 20 brains have a mean of 1059.2 cm cubed and a standard deviation of 128.9 cm cubed. 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 1287.0 cm cubed be significantly high?

Answer #1

The data would be significantly low if its less than - 2 *

The data would be significantly high if its greater than + 2 *

- 2 * = 1059.2 - 2 * 128.9 = 801.4

+ 2 * = 1059.2 + 2 * 128.9 = 1317

Since 1287 is less than 1317, it is not significantly high.

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