Concept explainers
a.
To check: Whether the sufficient evidences are provided the data that there has been decrease in blood pressure of the individual during this year at 5% significance level.
a.
Answer to Problem 6CRE
Yes, there is sufficient evidence.
Explanation of Solution
Given:
Formula used:
The formula to compute the test statistic is:
Calculation:
Using the information, the null and alternative hypotheses are:
Using the Ti-83 calculator the output is:
Decision rule:
The p-value is less than the significance level. Thus, decision is written as the rejection of the null hypothesis.
Conclusion:
At 5% significance level, there are sufficient evidence to support the provided claim.
b.
To find: Whether health campaign has reduced the blood pressure.
b.
Answer to Problem 6CRE
No.
Explanation of Solution
Since, the observational study does not influence the outcome and the provided case is an observational study. Thus, conclusion cannot be drawn here.
Chapter 9 Solutions
The Practice of Statistics for AP - 4th Edition
Additional Math Textbook Solutions
Elementary Statistics: Picturing the World (7th Edition)
Statistics: The Art and Science of Learning from Data (4th Edition)
Statistics for Business and Economics (13th Edition)
Introductory Statistics (2nd Edition)
Intro Stats, Books a la Carte Edition (5th Edition)
Essentials of Statistics (6th Edition)
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