Question: A random sample of 25 employees of a local company has been measured. A 95% confidence interval estimate for the mean systolic blood pressure for all company employees is 123 - 139. Which of the following statements is valid?

1. 95% of the sample of employees has a systolic blood pressure between 123 and 139
2. If the sampling procedures were repeated many times, 95% of the resulting confidence intervals would contain the population mean systolic blood pressure .
3. 95% of the population of employees has a systolic blood pressure between 123 and 139.
4. If the sampling procedure were repeated many times, 95% of the sample means would be between 123 and 139.

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