COLUMBAN COLLEGE INC., OLONGAPO CITYSENIOR HIGH SCHOOL- BASIC EDUCATION DEPARTMENT ASINANLEARNER'S MODULEE the StudentSection:have training courses is 555 with standard deviation of 139. Brain Philippine (BP) offersexpensive GRE training courses, claiming their graduates score better than those whohave not taken any training courses. To test the company's claim, a statisticianrandomly selected 30 graduates of BP and asked their GRE scores. They recorded amean score of 560 in GRE. Is the company's claim true, using a 95% confidence level?In building an arena, steel bars with a mean ultimate tensile strength of 400 Megapascal(MPa) with a variance of 81 MPa were delivered by the manufacturer. The projectengineer tested 50 steel bars and found out that the mean ultimate tensile strength is 390MPa. The decision for the extension of the contract with the manufacturer depends onthe engineer. Test the hypothesis whether there is no significant difference between thetwo means using a two – tailed with a = 0.01. Step 5: Sincez

Given Population mean μ=555, n=sample size=30, sample mean x̄=560, level of significance ɑ=0.05

Answered: have training courses is 555 with…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A famous welfare association in Karachi claims that it takes 9 minutes on average to reach its destination in emergency situations. To test this claim, the agency which licences ambulance services had them timed on 50 emergency calls, getting a mean of 10.4 minutes with a standard deviation of 2 minutes. At the 5% significance level test the claim that the average time the ambulance takes to reach its destination is 9 minutes.
A USA based cable broadband company wants to investigate whether it's east coasts customers have a higher average customer satisfaction score than compared to it's west coast customers. The customer survey asks for a score between 1 and 5, with 1 being poor and 5 being excellent. 174 east coast customers are surveyed, and the sample mean is 3.35 with a sample standard deviation of 0.51. For the west coast, 355 customers are surveyed, and the sample mean is 3.24 with a sample standard deviation of 0.52.
Fifty-five students were randomly selected from Airbender College, and their average score on a meditation course is 68.22 with a standard deviation of 18.8. Construct a 99% confidence interval for the mean test scores for all students at Airbender College. Also find the margin of error. Round your answers to 3 decimal places.
which one is right?
Bone mineral density (BMD) is a measure of bone strength. Studies show that BMD declines after age 45. The impact of exercise may increase BMD. A random sample of 59 women between the ages of 41 and 45 with no major health problems were studied. The women were classified into one of two groups based upon their level of exercise activity: walking women and sedentary women. The 39 women who walked regularly had a mean BMD of 5.96 with a standard deviation of 1.22. The 20 women who are sedentary had a mean BMD of 4.41 with a standard deviation of 1.02. Which of the following inference procedures could be used to estimate the difference in the mean BMD for these two types of women
According to a recent study published by the American Statistics for Educators Journal, statistics students spend, on average, 80 minutes a week playing video games. A certain instructor of statistics at WCC believes that WCC students spend less than this amount of time playing video games per week. To test his belief, he randomly samples 31 students and finds the sample mean to be 72 minutes with a standard deviation of 35 minutes. At the 0.05 level of significance, is there evidence to suggest that WCC students spend less than 80 minutes a week, on average, playing video games? Use the p-value approach. Define the parameter we are testing and setup a hypothesis to test the see if the statistics instructor is correct: Calculate the test statistics for this hypothesis test. What is the p-value for this hypothesis test?
The Fair Isaac Cooperation (FICO) credit score is used by banks and other lenders to determine whether someone is a good credit risk. Scores range from 330 to 850, with a score of 720 or more indicating that a person is a very good credit risk. An economist wants to determine whether the mean FICO score is lower than the cutoff of 720. She finds that a random sample of 60 people had a mean FICO score of 685 with a standard deviation of 80. Can the economist conclude that the mean FICO score is less than 720? Use the a=0.10 level of significance and the P-value method
A data set includes 106 body temperatures of healthy adult humans having a mean of 98.7°F and a standard deviation of 0.66°F. Construct a 99% confidence interval estimate of the mean body temperature of all healthy humans. What does the sample suggest about the use of 98.6°F as the mean body temperature?
A study of 22 goats reveals that the average length of a goat’s tail is 6.3 inches. If the standarddeviation is known to be 1.2 inches find a 95% confidence interval for the mean tail length.
A sample of 30 Microsoft employees yielded a mean of 44 hours worked per week with a standard deviation of 8 hours. What is the 95% confidence interval on the mean hours worked for Microsoft employees?

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