It has been reported that the variance of the speeds of drivers on theTurnpike near Somerset, PA is 64 for all vehicles. A driver who was pulledover near Somerset on the pike feels that value is incorrect and conducts a4.survey of speeds. He finds that the standard deviation of 50 vehicles is 10.5mph. At a0.05, is the driver correct?%3D

From the provided information, Sample size (n) = 50 Sample standard deviation (s) = 10.5 Level of…

Answered: It has been reported that the variance…

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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It takes an average of 14.6 minutes for blood to begin clotting after an injury. An EMT wants to see if the average will increase if the patient is immediately told the truth about the injury. The EMT randomly selected 60 injured patients to immediately tell the truth about the injury and noticed that they averaged 15.4 minutes for their blood to begin clotting after their injury. Their standard deviation was 2.66 minutes. What can be concluded at the the a = 0.10 level of significance? a. For this study, we should use Select an answer b. The null and alternative hypotheses would be: Но: ? Select an answer ♥ H: ? v| Select an answer v c. The test statistic (please show your answer to 3 decimal places.) d. The p-value = (Please show your answer to 4 decimal places.) e. The p-value is ? va f. Based on this, we should Select an answer | the null hypothesis. g. Thus, the final conclusion is that ... O The data suggest that the population mean is not significantly greater than 14.6 at a =…
In English class the final exam grades average 78 with a stanard deviation of 12 and in a mathematics class the final exam grades average 72 with a standard deviation of 15. If a student had a 84 on the English exand and a 82 on Mathematics exam, on which of the exams did the student to relatively better? (find z scores and compare them)
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A student took both the SAT and ACT before applying to college. For her graduation year, the mean SAT score was 1050 with a standard deviation of 210. The mean ACT score was 20.5 with a standard deviation of 5.5. Given that she scored 1120 on the SAT and 25 on the ACT, calculate her z-scores. Comparing z-scores, which test did she do better on?
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The manager at UPS feels that the weights of packages shipped recently are less than in he past. Records show that in the past packages have had a population mean weight of 36.7 pounds and a population standard deviation of 14.2 pounds. A random sample of last month's shipping records yielded a sample mean weight of 32.1 pounds for 64 packages. Does this indicate that the weights of packages recently shipped is less than 36.7 pounds? Use a = 0.01. Use the Classical Approach.
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