# <CO-a Search the web...ahoc Search ResultsWeb SearchChapter 7A webassign.net/web/Student/Assignment-Responses/submit?dep%3D22597272&tags3DautosaveHP ConnectedAppsMyLab & Mastering...6 Yahoo Search Resul...DevoreStat9 7E.046An article gave the following observations on maximum concrete pressure (kN/m).33.3 41.8 37.4 40.3 36.8 39.2 36.2 41.936.0 35.2 36.8 38.9 35.8 35.3 40.2(a) Is it plausible that this sample was selected from a normal population distribution?Because of the number of observations, we ascertain that it is plausible that this sample was taken from a normal population distribution.Using a normal probability plot, we ascertain that it is plausible that this sample was taken from a normal population distribution.Because of the number of observations, we ascertain that it is not plausible that this sample was taken from a normal population distribution.Using a normal probability plot, we ascertain that it is not plausible that this sample was taken from a normal population distribution.(b) Calculate an upper confidence bound with confidence level 95% for the population standard deviation of maximum pressure. (Round your answer to three decimal places.)You may need to use the appropriate table in the Appendix of Tables to answer this question.Need Help?Talk to a TutorWatch ItRead ItAsk Your TeacterMy Notes-13 points DevoreStat9 7 E.501.XP.43.A random sample of 108 lightning flashes in a certain region resulted in a sample average radar echo duration of 0.81 sec and a sample standard deviation of 0.43 sec. Calculate a 99%(two-sided) confidence interval for the true average echo duration u. (Round your answers to two decimal places.)

Question
Asked Dec 9, 2019
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Step 1

The given values are

33.3 41.8 37.4 40.3 36.8 39.2 36.2 41.9 36 35.2 36.8 38.9 35.8 35.3 40.2

Step 2

By using EXCEL

Mean= 37.67

Standard deviation= 2.5697

Step 3

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