YouTube ) FAR Defense FAB US FAB Box ) Odoo ( Off | nav20 burn STAT 211 Statistics With Aviation Appl - Mar 2022 - Online Yitav Kompel 05/02/22 7:51 AM Question 8, 11.5.14-T HW Score: 92, 9.2 of 10 points Homework: M7-Ch11 Hw Save Part 3 ol 3 Points: 0.2 of 1 A random sample of 20 purchases showed the amounts in the table (in $). The mean is $50 94 and the standard deviation is $21 53. 43 98 2967 87 59P a) Construct a 80% confidence interval for the mean purchases of all customers, assuming that the assumptions and conditions for the confidence interval have been met. 44 12 50 49 36 08 b) How large is the margin of error? 625 71.97 38.45 c) How would the confidence interval change if you had assumed that the population standard deviation was known to be 522? 25 47 32 24 58.83 47 71 32 79 58 84 68 36 73 39 89 57 69 00 54.08 a) What in the confidence interval? (44 55 57 34) (Round to two decimal places as needed ) b) What is the margin of error? The margin of error is 6.39 (Round to two decimal places as needed.) c) What is the confidence interval using the given population standard deviation? Select the correct choice below and fill in the answer boxes within your choice (Round to two decimal places as needed ) A. The new confidence interval ( , ) is wider than the interval from part a. B. The new confidence interval ( 44.64 .57 25 ) is narrower than the Interval from part a. Help me solve this View an example Get more help - Similar question 1451 2 May 2022