Apps. and Interpretation for IBDP Maths Ebook 2 | Page 266

Your Practice Set – Applications and Interpretation for IBDP Mathematics SE Production Limited 256 Chapter 17 Interval Estimation � ( 1 )% � � confidence interval for population mean � when the population variance 2 � is known : 1 . 1 2 n X X X X n � � � � : Sample mean 2 . 2 2 , X z X z n n � � � � � � � � � � � � � � , where 2 2 P Z z _� � � � � � � � � � 3 . 2 2z n � � � : Interval width � ( 1 )% � � confidence interval for population mean � when the population variance 2 � is unknown : 1 . 1 1 1 , 1 , 2 2 , n n n n s s X t X t n n � � � � � � � � � � � � � � � � , where 1 , ₂ 2 n P X t � � � � � � � � � � � 2 . 1 1 , ₂ 2 n n s t n � � � � : Interval width Solutions of Chapter 17 SUMMARY POINTs