Finding the z-value or t-value

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For individuals who have not been prescribed Atenolol, the population systolic blood pressure mean is 165 (µ = 165). The 143 individuals who take Atenolol have an average systolic blood pressure of 170, with a sample standard deviation of 21. On the basis of these data, can the researcher conclude that the Atenolol significantly lowers systolic blood pressure?

What is the z-value or t-value you obtained (your test statistic)?

Jun 15th, 2015

Thank you for the opportunity to help you with your question!

Using the Z value

z=µ-x/ d

where µ is the population mean

x is the sample mean

d is the standard deviation

Ho:The Atenolol intake does not reduce systolic blood pressure

H1:The Atenolol intake reduce systolic blood pressure



Compare the value with z critical at 5% level of significance


Since the z calculated is more than z critical,we reject the null hypothesis and conlcude that  Atenolol intake  reduce systolic blood pressure.

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 15th, 2015

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