What is the main purpose of a confidence interval?
Question 2
A $95\%$ confidence interval for a population mean is found to be $12.4$ to $15.8$. What does this interval represent?
Question 3
What happens to the width of a confidence interval when the confidence level increases from $90\%$ to $95\%$, with the sample size and method unchanged?
Question 4
Which statement best describes a $95\%$ confidence level?
Question 5
A sample mean is $50$. Which interval is likely to have the smallest margin of error, assuming the same method and confidence level?
