What is different about the normality requirement for a confidence interval estimate of the population standard deviation and the normality requirement for a confidence interval estimate of the population mean?

What is different about the normality requirement for a confidence interval estimate of the population standard deviation and the normality requirement for a confidence interval estimate of the population mean?2. Why is it recommended to formulate a hypothesis so that it becomes the alternative (but not null) hypothesis?True or False?3. The higher the confidence level, the narrower the confidence interval.4. A type I error occurs if we incorrectly reject the null hypothesis when there was not enough evidence to do so from our testing.