Question

A certain group of test subjects had pulse rates with a mean of 76.1 beats per minute and a standard deviation of 11.6 beats per minute. Use the range rule of thumb for identifying significant values

to identify the limits separating values that are significantly low or significantly high. Is a pulse rate of 69.3 beats per minute significantly low or significantly high?
Significantly low values are beats per minute or lower.
(Type an integer or a decimal. Do not round.)

Answer 1

To identify significantly low or significantly high values using the range rule of thumb, we can use the formula:

Significantly Low Value = Mean - (2 * Standard Deviation)
Significantly High Value = Mean + (2 * Standard Deviation)

For this problem, the mean is 76.1 beats per minute and the standard deviation is 11.6 beats per minute.

Significantly Low Value = 76.1 - (2 * 11.6)
Significantly High Value = 76.1 + (2 * 11.6)

Calculating these values:
Significantly Low Value = 76.1 - (2 * 11.6) = 52.9
Significantly High Value = 76.1 + (2 * 11.6) = 99.3

A pulse rate of 69.3 beats per minute falls below the significantly low value of 52.9 beats per minute. Therefore, a pulse rate of 69.3 beats per minute is significantly low.