Question

When making a statistical inference about the mean of a normally distributed population based on a sample drawn from that population, which of the following statements is correct, all else being equal?

Answer 1

The 68% confidence interval is wider than the 90% confidence interval.
The 90% confidence interval is narrower than the 95% confidence interval.
The 90% confidence interval is wider than the 99% confidence interval.
The 99% confidence interval is narrower than the 68% confidence interval

Answer 2

When the confidence percentage is raised, the confidence interval becomes wider.
When the confidence percentage is lowered, the confidence interval becomes narrower.