8. To reach maximum efficiency in performing an assembly operation in a manufacturing plant, new employees require approximately 1-month training period. A new method of training was suggested, and a test was conducted to compare the new method with the standard procedure. The length of time (in minutes) required for each employee to assemble the device was recorded at the end of the 3-week period and the summary results are given below: Standard New Sample size 9. 9. Sample Mean 35.22 31.56 Sample Variance 24.445 20.027 Do you need to make any assumption to obtain the confidence interval for the difference of the mean times of assembling the devices in standard and new procedures? Explain clearly why? Based on your assumption, find a 95% confidence interval for this. Comment on your finding. Justify your method that you used to obtain the interval.

8. To reach maximum efficiency in performing an assembly operation in a manufacturing plant, new employees require approximately 1-month training period. A new method of training was suggested, and a test was conducted to compare the new method with the standard procedure. The length of time (in minutes) required for each employee to assemble the device was recorded at the end of the 3-week period and the summary results are given below: Standard New Sample size 9. 9. Sample Mean 35.22 31.56 Sample Variance 24.445 20.027 Do you need to make any assumption to obtain the confidence interval for the difference of the mean times of assembling the devices in standard and new procedures? Explain clearly why? Based on your assumption, find a 95% confidence interval for this. Comment on your finding. Justify your method that you used to obtain the interval.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

23. Using MIL-STD-105E, design the inspection plans for single and double sampling for the data below. Provide a simplified set of instructions for a novice inspector with no previous experience of AQL sampling to use to perform this inspection. State code letters, sample sizes, accept/reject numbers, etc. Lot size of 3,700 screws Normal inspection, general inspection level II. AQL = 2.5%
What are the population parameters? Pick one: The difference in the sample sizes The difference in the two sample means The mean time spent for all test-takers before and after tutoring The mean time spent for all test-takers before and after tutoring combined Does sufficient or insufficient evidence exist?
The fill size for a small bag of peanuts distributed by a popular airline is 50 grams. The producer wishes to set up a set of control charts for this process and collects the data shown in the table. Item #1 Sample 1 54.5 2 50.6 3 51.1 4 52.7 5 51.7 6 51.1 7 54.0 8 53.2 9 51.9 What is the sample size? a. 4 Ob.9 c. 13 d. 45 Item #2 54.3 53.5 54.3 52.1 51.2 51.5 52.3 50.4 50.2 Item #3 53.8 53.2 50.4 51.3 54.7 54.7 54.7 53.4 50.2 Item #4 50.4 54.9 50.7 51.0 54.3 50.4 51.4 51.4 52.9
answer mmultiple choice
A method or a set of procedures of using sample data to estimate a population parameter is called A. statistical inference B. statistical interference C. statistical appliance D. statistical description