A staff member at UF\'s Wellness Center is interested in seeing if a new stress

Question

A staff member at UF's Wellness Center is interested in seeing if a new stress reduction program will lower employees systolic blood pressure levels. Twenty people are selected and have their blood pressure measured. Each person then participates in the stress reduction program. One month after the stress reduction program, the systolic blood pressure levels of the employees were measured again. Did the program reduce the average systolic blood pressure level? Note: Differences were taken by taking "before systolic blood pressure" minus "After blood pressure" The 95% confidence interval was (5.6, 10.2). O The population mean systolic blood pressure levels after the stress reduction program were significantly higher than the population mean systolic blood pressure levels before the stress reduction program, at the 95% confidence level. o We are 95% confident that there is no difference in population average systolic blood pressure levels before and after the stress reduction program. o The population mean blood pressure levels before the stress reduction program were significantly higher than the population mean systolic blood pressure levels after the stress reduction program, at the 95% confidence level.

Explanation / Answer

Since the confidence interval is positive and 0 is not in the interval,

Answer: Option C. The population mean blood pressure levels before the stress reduction program were significantly higher than the popultaion mean systolic blood pressure levels after the stress reduction program, at the 95% confidence level.

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