Question

Answer the following questions

Description Suppose you want to find the confidence interval for the mean. 1) When would you use the formula involving the t? 2) When would you use the formula involving the z? 3) If sigma is known, n < 30, and you have no information about the population distribution. Which of the following choices would be the correct course of action to take to find the confidence interval? (a) Use the t-formula (b) Use the z-formula (c) Something else

Answer 1

use Z and t formula. we must use solution is first we understand when we o when Sample size ~ 530 and we don't know the population Standard deviation then we must use t toumula'. © when csample size 7730 and we know the population Standard deviction then z formula. Now, we give answers of given questions O when Sample size ně30 then we use formula involving t Hou calculating confidence interval. when Sample size 7730 then we involving z fost calculating confidence interval. is known, n<30 and you have no intosimeation about the population distribution, then we use t-formula fou find the confidence interval. oo Answers-y t-for miela. use, formula 2 3 25 sigma X

have any -> hope you understand. Dt you doubt then comment it. Thank you