Question

QUESTION 1 Find t ? /2, where ?-OOS and n-15. Give 3 decimals. QUESTION 2 10 Find ta/ 2. where -0.05 and n-30 Give 3 decimals. QUESTION 3 Find Za/ 2, where ?-: O.05 and n . 30. Give hecimals. QUESTION 4 What sampling distribution is used for means when the population standard deviation, ? is known and the population is no distributed? O binomial distribution O Student t distribution O Depends on the sample size O Normal, z mally Click Save and Submit to save and submit. Click Save All Answers to save all Save All

Answer 1

Alpha = 0.05 and n = 15 , t_alpha/2 = 1.75305 = 1.753 2) alpha = 0.05 and n = 30 , t-alpha/2 = 1.697261 = 1.697 3) alpha = 0.05 and n = 30 t_alpha/2 = 0.25405 = 0.254 4) When population standard deviation T is known and the population is normality distribution , one sampling distribution is used for mean s is normal Z. 5) when population standard deviation T is an known and population is normally distributed, the sampling distribution is used for mean is student t - distribution. 6) X^_ = 20, s = 4, n = 36 , alpha = 0.01 The best point estimate for me mean is X^- = 20 7) x^- = 20, s = 4 , n = 36 , alpha = 0.01 the critical value used for confidence interval is - 2.723