SOLUTION: A health care professional wants to determine whether individuals with hypertension who take Atenolol have significantly lower systolic blood pressure than individuals with hyperte

Question 881666: 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 (� = 165). The 30 individuals who take Atenolol have an average 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?

Calculate the 95% confidence interval
What is the new critical value you will use for this calculation?

+/- 1.699

+/- 2.045

+/- 2.457

+/- 2.462

- 2.045

A psychologist is interested in knowing whether adults who were bullied as children differ from the general population in terms of their empathy for others. On a questionnaire designed to measure empathy, the mean score for the general population is 43.52. Random sampling of 25 scores obtained from individuals who were bullied yielded a mean of 49.66 and a standard deviation of 10.96. (Use these numbers only for this question!)
Calculate the 99% confidence interval.
Steps:
As you know, two values will be required to complete the following equation:

_________ ≤ � ≤ __________
For this question, what is the value that is below or less than �?

Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
30 individuals who take Atenolol: mean = 147, s = 6.
Calculate the 95% confidence interval.
DF 29, t* < .05, t* = -1.669
25 scores: mean of 49.66 and a standard deviation of 10.96.
Calculate the 99% confidence interval. 2-sided
DF 24, t* < .005, t* = -2.797
ME = 2.797(10.96/5)
43.52 - ME ≤ � ≤43.52 + ME
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