8-3 homework chapter 8 question 4

Use the sample information - 40, 0-7. n= 13 to calculate the following confidence intervals for j assuming the sample is from a normal population. () 90 percent confidence. (Round your answers to 4 decimal places.) The 90% confidence interval is from to (b) 95 percent confidence (Round your answers to 4 decimal places.) The 95% confidence interval is from to () 99 percent confidence (Round your answers to 4 decimal places.) The 99% conf ence interval is fromto (d) Describe h you increase the confidence level