The width of a confidence interval estimate for a population mean when the population standard deviation (sigma) is known will

become wider if the sample size remains the same and the confidence level decreases

become wider if the sample size increases and the confidence level is unchanged

become narrower if the size of the sample being used is increased and the confidence level is unchanged

not change if only the sample size is increased

become narrower if the size of the sample is decreased and the confidence level is unchanged