Motorcycle Noise A recent study of 42 motorcycles found that the average noise pollution in decibels is 90. If the populationstandard deviation is 3.8 decibels, find the 93% confidence interval for the mean. Round answers to the nearest wholedecibel. Round intermediate answers to two decimal places.We are 93% confident that the mean noise pollution level is between andmotorcycles..decibels, based on a sample of 42

Sample size Mean Standard deviation Confidence

Answered: Motorcycle Noise A recent study of 42…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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Give a 95% confidence interval for the true mean time students spent practicing for the play. x-bar=45.6 s=13.3 n=120
You measure 38 dogs' weights, and find they have a mean weight of 64 ounces. Assume the population standard deviation is 5.6 ounces. Based on this, construct a 99% confidence interval for the true population mean dog weight. Round Iyour answers to two decimal places. <με Enter an integer or decimal number [more..
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A marine biologist would like to estimate the mean weight of all mahi mahi on the Treasure Coast, using a 99% confidence interval. The standard deviation of the weights of all mahi mahi on the Treasure Coast is known to be 8.2 pounds. How large a sample of mahi mahi should the marine biologist select so that the estimate is within 0.88 pounds of the true population mean. Round the solution up to the nearest whole number. n=
Question 3 You measure 24 textbooks' weights, and find they have a mean weight of 35 ounces. Assume the population standard deviation is 9 ounces. Based on this, construct a 95% confidence interval for the true population mean textbook weight. Give your answers as decimals, to two places Calculator > <μ<
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Choose the appropriate statistical test. When computing, be sure to round each answer as indicated. A dentist wonders if depression affects ratings of tooth pain. In the general population, using a scale of 1-10 with higher values indicating more pain, the average pain rating for patients with toothaches is 6.8. A sample of 30 patients that show high levels of depression have an average pain rating of 7.1 (variance 0.8). What should the dentist determine? 1. Calculate the estimated standard error. (round to 3 decimals). [st.error] 2. What is thet-obtained? (round to 3 decimals). 3. What is the t-cv? (exact value) 4. What is your conclusion? Only type "Reject" or Retain"
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