Problemas
Scenario (High Pressure Situation): More than a 1000 miltion odustin the United States have high bleod pressure. A study investigates the effect of a new anthipertenstive medication on systolic blood pressure. Researchers randomly selected 10 patients diagnosed with high blood pressure and measured their systolic blood pressure before starting medication. After 8 weeks of toking the nea mediectien. the patients' systolic blood pressure was measured again. The researchers calculate the difference in blood pressure for each patient (before minus after). A dot plot of the differences indicated that the mean of the differences was normally distributed. Before & 150 & 160 & 145 & 155 & 148 & 152 & 160 & 155 & 158 & 150 & 5=5.1434 After & 133 & 142 & 131 & 140 & 133 & 140 & 145 & 140 & 142 & 136 & 5=4.6619 Determine at the 01 significance level whether or not the medication is effective in lowering systolic blood pressure. Label/List a) mu= b) s_(x)= Formula c) bar(x)= d) n= Inference Procedure t=(bar(x) d-M d)/(sqrt(frac(s)(n))) Hypothesis Ho: M=0 HA:M 0
Roztwór
Deborah
maestro · Tutor durante 5 años
4.1
(372 Votos)
Respuesta
To determine whether the new antihypertensive medication is effective in lowering systolic blood pressure at the 0.01 significance level, you can perform a one-sample t-test on the differences in blood pressure before and after taking the medication. Here are the steps to follow:1. **State the Hypotheses:** - Null Hypothesis (
): The mean difference in systolic blood pressure (before minus after) is zero. This implies that the medication has no effect. - Alternative Hypothesis (
): The mean difference in systolic blood pressure is greater than zero. This implies that the medication is effective in lowering blood pressure.2. **Significance Level:** -
3. **Calculate the Test Statistic:** - Use the formula for the t-statistic:
where
is the sample mean of the differences,
is the hypothesized population mean difference (0 in this case),
is the standard deviation of the differences, and
is the sample size.4. **Determine the Critical Value:** - For a one-tailed test at the 0.01 significance level with
degrees of freedom, find the critical t-value from the t-distribution table.5. **Make a Decision:** - If the calculated t-statistic is greater than the critical t-value, reject the null hypothesis. Otherwise, do not reject the null hypothesis.6. **Conclusion:** - Based on the decision, conclude whether there is sufficient evidence to suggest that the medication is effective in lowering systolic blood pressure at the 0.01 significance level.