A confidence interval for a population mean has length 22. a) Determine the margin of error. b) If the sample mean is 63.1, obtain the confidence interval. Confidence interval: ( , ).

Answer 1

interval length =22

margin of error= 22/2= 11

mean = 63.1

interval =(63.1-11, 63.1+11)= (52.1, 74.1)