Question

Express the confidence interval ( 196.6 , 416 ) in the form of ¯ x ± M E . ¯ x ± M E = ±

Answer 1

Solution :

given that

Lower confidence interval = 196.6

Upper confidence interval = 416

  = (Lower confidence interval + Upper confidence interval ) / 2

= ( 196.6+ 416) / 2

Sample mean = =306.3

Margin of error = E = Upper confidence interval -

= 416-306.3

Margin of error = E  =109.7

¯ x ± M E

306.3 ± 109.7