A random sample of 25 employees of a local company has been taken. A 95% confidence interval estimate for the mean systolic blood pressure for all employees of the company is 123 to 139 . Which of the following statements is valid?
a. 95% of the sample of employees has a systolic blood pressure between 123 and 139
b. If the sampling procedure were repeated many times, 95% of the resulting confidence intervals would contain the population mean systolic blood pressure.
c. 95% of the population of employees has a systolic blood pressure between 123 and 139.
d. If the sampling procedure were repeated many times, 95% of the sample means would be between 123 and 139.
b
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