A health care professional wants to determine whether
individuals with hypertension who take Atenolol have significantly
lower systolic blood pressure than individuals with hypertension
who do not take Atenolol. For individuals who have not been
prescribed Atenolol, the population systolic blood pressure mean is
165 (µ = 165). The sample of 30 individuals who take Atenolol have
an average (mean) systolic blood pressure of 147, with a sample
standard deviation of 6. On the basis of these data, can the
researcher conclude that the Atenolol significantly lowers systolic
blood pressure? Set alpha equal to .01.
The best conclusion for this example
Solution :
= 165
=147
s = 6
n = 30
This is the two tailed test .
The null and alternative hypothesis is ,
H0 : = 165
Ha : 165
Test statistic = t
= ( - ) / s / n
= (147-165) /6 / 30
= −16.432
Test statistic = t =−16.432
P-value = 0
= 0.01
P-value <
0 < 0.01
Reject the null hypothesis .
There is sufficient evidence to suggest that
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