Question

People with heart arrhythmia are known to have a resting pulse rate of 110 with a standard deviation of 5. With a new
experimental treatment, a group of 100 patients who suffer from heart arrhythmia has a resting pulse rate lowered to
108. Does this provide significant evidence that the experimental medication is effective at reducing resting pulse rate?
A. Yes, the test value is in the rejection region
B. No, the test value is not in the rejection region
C. Yes, the test value is not in the rejection region
OD. No, the test value is in the rejection region

Answer 1

The answer will be option A Yes, the test value is in the rejection region.

What is Z-score?

A Z-score is a numerical measurement that describes a value's relationship to the mean of a group of values.

here the formula will be

$Z=\dfrac{X-\mu}{\dfrac{\sigma}{\sqrt {n}}}$

$Z=\dfrac{100-110}{\dfrac{5}{\sqrt{100}}}$

$Z=-20$

Z critical value =-1.645

Z calculated> Z critical value so we will reject.

Hence the answer will be option A Yes, the test value is in the rejection region.

To know more about z-score follow

https://brainly.com/question/25638875

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