Question

5 points Save Answer A sample of 25 observations is selected from a normal population where the population standard deviation is 20. and the sample mean is 120 Calculate the Lower Limit of the 70% confidence interval of the population mean. Reminder: You only need to calculate the Lower Limit of the confidence interval. Moving to the next question prevents changes to this answer Activate Wind Gustion 2016

Answer 1

The solution to this problem is given by

BREW Solution Given daeth is Sample size = na 25 Population SD = = = sample mean a t= 1go Since pobulada standard deviation is known, so will use use 'želiskibution The 70% confidence interval Jod mean is given by where 0.385 is ñ + 0.385 the critical vake un at od 70% (I) 120 + 0.385 x 90 U25 120 Đ 1.54 20 ( 118.46 I 121154 ) Lower Lion't - 118.46 0