Mathematics

Mathematics, 06.07.2019 00:20, tamiyahtapp

Noise levels at 5 airports were measured in decibels yielding the following data: 162,176,162,141,159 construct the 90% confidence interval for the mean noise level at such locations. assume the population is approximately normal. find the critical value that should be used in constructing the confidence interval. round your answer to three decimal places.

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Physics, 03.07.2019 10:50, Odog9458

High levels of cockpit noise in an aircraft can damage the hearing of pilots who are exposed to this hazard for many hours. cockpit noise in a jet aircraft is mostly due to airflow at hundreds of miles per hour. this 3 × 3 contingency table shows 61 observations of data collected by an airline pilot using a handheld sound meter in a certain aircraft cockpit. noise level is defined as “low” (under 88 decibels), “medium” (88 to 91 decibels), or “high” (92 decibels or more). there are three flight phases (climb, cruise, descent).

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Physics, 05.07.2019 17:10, Albertrami2251

Noise levels at 5 airports were measured in decibels yielding the following data: 147,123,119,161,136 construct the 99% confidence interval for the mean noise level at such locations. assume the population is approximately normal. calculate the sample standard deviation for the given sample data. round your answer to one decimal place.

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Mathematics, 09.08.2019 19:10, montanolumpuy

Suppose that you have a sample size n = 100 with mean x = 5 and standard deviation s = 2, and that you are to construct a confidence interval for the population mean \mu μ . if, after you obtain the confidence interval, you find it to be too wide, which of the following remedial steps can you take to reduce the width of the confidence interval? a. to construct a 90% confidence interval instead of a 95% one. b. to construct a 99% confidence interval instead of a 95% one. c. to re-do the 95% confidence interval with only a half pf the sample data.

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Mathematics, 18.10.2019 05:00, miahbaby2003p2af1b

Refer to the accompanying data display that results from a sample of airport data speeds in mbps. the results in the screen display are based on a 95% confidence level. write a statement that correctly interprets the confidence interval. tinterval (13.046,22.15) x overbarequals17.598 sxequals16.01712719 nequals50 choose the correct answer below. a. we have 95% confidence that the limits of 13.05 mbps and 22.15 mbps contain the true value of the mean of the population of all data speeds at the airports. b. we have 95% confidence that the limits of 13.05 mbps and 22.15 mbps contain the sample mean of the data speeds at the airports. c. the limits of 13.05 mbps and 22.15 mbps contain the true value of the mean of the population of all data speeds at the airports. d. the limits of 13.05 mbps and 22.15 mbps contain 95% of all of the data speeds at the airports.

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Noise levels at 5 airports were measured in decibels yielding the following data: 162,176,162,141,1...

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