Question

A certain group of test subjects had pulse rates with a mean of

78.778.7

beats per minute and a standard deviation of

11.911.9

beats per minute. Use the range rule of thumb to identify the limits separating values that are significantly low or significantly high. Is a pulse rate of

142.5142.5

beats per minute significantly low or significantly​ high?

Significantly low values are

nothing

beats per minute or lower.

​(Type an integer or a decimal. Do not​ round.)

Significantly high values are

nothing

beats per minute or higher.

​(Type an integer or a decimal. Do not​ round.)

Is a pulse rate of

142.5142.5

beats per minute significantly low or significantly​ high?

A.

Significantly lowSignificantly low​,

because it is

less thanless than

two standard deviations

belowbelow

the mean.

B.

NeitherNeither​,

because it is

withinwithin

two standard deviations

ofof

the mean.

C.

Significantly highSignificantly high​,

because it is

greater thangreater than

two standard deviations

aboveabove

the mean.

D.

It is impossible to determine with the information given.

Answer 1

Solution :

Given that ,

mean = = 78.7

standard deviation = = 11.9

Use the range rule of thumb,

Significantly low value = - 2

Significantly low value = 78.7 - 2 * 11.9

Significantly low value = 54.9

Significantly high value = + 2

Significantly high value = 78.7 + 2 * 11.9

Significantly high value = 102.5

C Significantly high​,because it is greater than two standard deviations above the mean.