A company would like to know if efficiency can be improved through a training course for employees. A sample ofemployees is taken. The time taken for an employee to complete a task before training and after training is observed.MeanVarianceObservationsHypothesized Mean Differencedft StatP(T<=t) one-tailt Critical one-tailP(T<=t) two-tailt Critical two-tailConfidence LevelBeforen =33.116.8130029-2.2820.051-1.6990.025-2.04595%After31.712.2530p= Ex: 1.234:-3 -2t = Ex: 1.234Ex: 9Degrees of freedom: df =Point estimate for before training: before Ex: 1.234Point estimate for after training: after-10123

Answered: Image /qna-images/answer/cca7f753-9140-431a-ad5c-d0f3e405b52d.jpg

Answered: A company would like to know if…

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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Times for a surgical procedure are normally distributed. There are two methods. Method A has a mean of 31 minutes and a standard deviation of 4 minutes, while method B has a mean of 35 minutes and a standard deviation of 2.0 minutes. (a) Which procedure is preferred if the procedure must be completed within 33 minutes? multiple choice 1 Method A Method B Either Method (b) Which procedure is preferred if the procedure must be completed within 41.0 minutes? multiple choice 2 Method A Method B Either Method
Part Variability is critical in the manufacturing of the ball bearings. Large variances in the size of the ball bearings cause bearing failure and rapid wear out. Production standards call for a maximum variance of .0001 when the bearing sizes are measured in inches. A sample of 15 bearings shows a sample standard deviation of .014. a. Compute the 90% confidence interval estimate of the variance of the ball bearings in the population. b. Use a= 0.10 to determine whether the sample indicates that the maximum acceptable variance is being exceeded. Use critical value approach. ( Note: You must state null and alternative hypotheses, compute the test statistic, Report the critical Value, and draw a conclusion.
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What is the test statistic?(round to two decimal places) What is the pvalue?(round to three decimal places) (Reject or don’t reject) the null hypothesis ?
Smoke-Free Legislation and AsthmaHospital admissions for asthma in children younger than 15 years was studied1 in Scotland both before and after comprehensive smoke-free legislation was passed in March 2006. Monthly records were kept of the annualized percent change in asthma admissions, both before and after the legislation was passed. For the sample studied, before the legislation, admissions for asthma were increasing at a mean rate of 5.2% per year. The standard error for this estimate is 0.7% per year. After the legislation, admissions were decreasing at a mean rate of 18.2% per year, with a standard error for this mean of 1.79%. In both cases, the sample size is large enough to use a normal distribution.1Mackay, D., et. al., ‘‘Smoke-free Legislation and Hospitalizations for Childhood Asthma,” The New England Journal of Medicine, September 16, 2010; 363(12):1139-45. (a) Find a 95% confidence interval for the mean annual percent rate of change in childhood asthma hospital…
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