A. 95% of the sample data falls within the interval. B. We are 95% confident the population parameter is within the interval. C. The interval will contain the parameter 95% of the time. D. 95% chance of making a Type I error.

A. The population mean is exactly 15. B. The population mean is between 10 and 20. C. The sample mean is between 10 and 20. D. The population mean is less than 10.