A university surveyed recent graduates of the English Department for their starting salaries. Four hundred graduates returned the survey. The average salary was $25,000. The population standard deviation is $2,500. A 95% confidence interval is [24105.4, 25894.6]. What does the confidence interval mean? (This is a multiple-answer question. Please select all the correct answers to this question.) The population mean is in the interval. The interval contains 95% of all sample means 95% chance that the true population mean is within [24105.4, 25894.6]. If we can collect 500 sample means, approximately 475 out of 500 sample means contain the true population mean