Question

lues listed are waiting times (in minutes) of customers at the Jeffterson Bank, where (1 pomt) customers enter a single waiting line that feeds three teller windows. Find the critical values 21 and 2 corresponding to a 95% confidence level 65 6.6 6.7 6.8 7.1 73 74 77 7.7 77 3.325, 16.919 2.700, 19.023 3247, 20483 1.237, 14.449 5. Given a sample size of 20, what are the critical values 22 and for a 95% confidence level? (1 point) 8.907, 32.852 9.591, 34.170 10.117, 30.144 6844, 38.582 6. 62 random samples of city rent prices are selected from a normally distributed population. The (1 point) samples have a mean of $738 and a standard deviation of $41. Construct a 95% confidence interval for the population standard deviation $35.10 < ơ $50.30 $5.50 < σ< S7.90 $32.80 ơ $45.90 O $38.20 < ơ < $47.20

Answer 1

4) n=10 , alpha= 0.95

Chi square critical value = chi sq L = 2.700

Chi sq R = 19.023

Answer :- ( 2.700,19.023)

5) n=20, alpha = 0.95

Chi sq L = 8.907

Chi sq R = 32.852

6) n=62, alpha = 0.95, s= 41 , s2=1681

Confidence interval population standards deviation

Low end= sqrt [ (n-1)×s2 / chisq-L ] = sqrt[61×1681/84.476]

Low end = 35.10

High end = sqrt [ (n-1)×s2 / chi sq R ] = sqrt [61×1681/ 41.3032 ]

High end = 50.30