Question 6A study on a range of automotive lubricants reported the following data on oxidation-induction time(min) for various commercial oils:Oxidation-Induction Time: 87103130160180195132145211105145153152138879993119129а.Calculate the sample variance and standard deviation for the oxidation-induction time.

Given data is87,103,130,160,180,195,132,145,211,105,145,153,152,138,87,99,93,119,129sample…

Answered: Question 6 A study on a range of…

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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QUESTION 2 In 2003, Major League Baseball took steps to speed up the paly of baseball games and make games a more consistent duration. In a sample of 41 games in 2002, the average duration of a game was 2 hours and 58 minutes with a standard deviation of 30 minutes. A similar survey in 2003 of 31 games found that the average duration was 2 hours and 40 minutes with a standard deviation of 22 minutes. When testing the hypothesis (at the 10% level of significance) that the variance has been reduced, what is the critical value? (please round your answer to 2 decimal places)
Question 2 The time for an older machine to do a quality check on a newly manufactured tire,X1, has mean of 65 seconds and variance 16, while the time for a newer model, X2, has mean 45 seconds and variance 9. Find the expected time savings using the newer model whena) checking a single tire;b) checking 200 tires.c) Find the standard deviation in parts a) and b), assuming all the checking times areindependent.
Question # 19. With individual lines at its various windows, a post office finds that the standard deviation for waiting times for customers on Friday afternoon is 7.2 minutes. The post office experiments with a single, main waiting line and finds that for a random sample of 25 customers, the waiting times for customers have a standard deviation of 3.5 minutes on a Friday afternoon. With a significance level of 5%, test the claim that a single line causes lower variation among waiting times for customers
Question 2. A random sample of 22 values was selected from a population and the sample standarddeviation was computed to be 340. Based on this sample result, compute a 90% confidenceinterval estimate for the true population standard deviation. Question 3. Two samples of sizes 15 and 16 are drawn from two normally distributed populations havingmeans of 16 and 11, respectively. If the sample variances are 6 and 5, determine whether the firstsample has significantly lower variance than the second sample at 0.025 significance level
QUESTION 1 What are the degrees of freedom for a study that used a paired samples t-test and had 63 people in the study? QUESTION 2 A study used a within the design and had a degree of freedom of df= 49. How many participants were in the sample? QUESTION 3 Why do we not test for homogeneity with a paired samples t-test? we assume that the two samples we have chosen will have the same variance since the same sample is used in both conditions, we assume the data remains homogeneous the variance is too large that we cannot perform the test we assume there is no variability when using paired sample designs
Question 18 A quality-assurance inspector periodically examines the output of a machine to determine whether it is properly adjusted. When set properly, the machine produces nails having a mean length of 2.000 inches, with a standard deviation of 0.070 inches. For a sample of 35 nails, the mean length is 2.025 inches. If the null and alternative hypotheses can be used to conclude that the machine is adjusted properly, at 15% level of significance, what is your conclusion? There is enough evidence to support the claim There is no enough evidence to support the claim There is enough evidence to reject the claim There is no enough evidence to reject the claim
QUESTION 7 As an owner of a business, having a consistent level of sales is important. Prior to the recession that started in 2007, the standard deviation of the sales of a local business was $581. In a sample of 29 weeks since the start of the recession, sales have averaged $6800 per week with a standard deviation of $754. When testing the hypothesis (at the 5% level of significance) that the variance is higher than it was pre-recession (so the null hypothesis is that the variance is less than 5812 ), what is the critical value? (please round your answer to 2 decimal places)
Question 20. part C. Nationally, patients who go to the emergency room wait an average of 7 hours to be admitted into the hospital. Do patients at rural hospitals have a lower waiting time? The 14 randomly selected patients who went to the emergency room at rural hospitals waited an average of 5.8 hours to be admitted into the hospital. The standard deviation for these 14 patients was 1.7 hours. What can be concluded at the the αα = 0.05 level of significance level of significance? F.) Based on this, we should Select an answer accept, reject or fail to reject the null hypothesis? G.) Thus, the final conclusion is that ... (Which one) The data suggest the populaton mean is significantly lower than 7 at αα = 0.05, so there is statistically significant evidence to conclude that the population mean waiting time to be admitted into the hospital from the emergency room for patients at rural hospitals is lower than 7 hours. The data suggest the population mean is not significantly lower…

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