A 99% confidence interval for the population mean is (2, 14). Which of the following statements is correct? a) 1% of the time the sample mean will be outside the interval. b) The 95% confidence interval will contain zero. c) The null hypothesis that the population mean is 16 will be rejected at the significance level of 1%. d) The centre of the 95% confidence interval will be 0. e) The sample mean equals 6