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.

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