Please answer the following

As the sample size increases, the standard error of the mean increases. standard deviation of the population decreases. population mean increases. standard error of the mean decreases. DETAILS A 95% confidence interval for a population mean is determined to be 300 to 320. For the same data, if the confidence coefficient is reduced to 0.90, the confidence interval for u becomes narrower. becomes 300.1 to 320.1. I does not change. becomes wider. DETAILS The level of significance a O is always a negative value. can be any positive value. can be any value between -1.96 to 1.96. is (1 - confidence coefficient)