How much noisier are streets where cars travel faster? The article "Modeling of Urban AreaStop-and-Go Traffic Noise" (P. Pamanikabud and C. Tharasawatpipat, Journal ofTransportation Engineering, 1999:152–159) reports noise levels in decibels and averagespeed in kilometers per hour for a sample of roads. The following table presents the results.SpeedNoise28.2678.136.2279.638.7381.029.0778.730.2878.630.2578.529.0378.433.1779.6Compute the least-squares line for predicting noise level (y) from speed (x).b. Compute the erTor standard deviation estimate s.Construct a 95% confidence interval for the slope.Find a 95% confidence interval for the mean noise level for streets whose averagespeed is 30 kilometers per hour.Can you conclude that the mean noise level for streets whose average speed is 30kilometers per hour is greater than 78 decibels? Perform a hypothesis test and reporta.C.d.e.the P-value.f.Find a 95% prediction interval for the mean noise level for streets whose average speedis 30 kilometers per hour.

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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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2. Violent crimes include rape, robbery, assault, and homicide. The following is a summary of the violent-crime rate (violent crimes per 100,000 population) for all states of a country in a certain year. Q1 = 237.5, Q2 = 352.9, Q3 = 441 (a) Provide an interpretation of these results. (b) Determine and interpret the interquartile range. (c) The violent-crime rate in a certain state of the country in that year was 1,159.2. Would this be an outlier? Why?
7.2.4
Several methods of estimating the number of seeds in soil samples have been developed by ecologists. An article gave the accompanying data on the number of seeds detected by the direct method and by the stratified method for 27 soil specimens. Specimen Direct Stratified 1 21 6 2 32 38 3 0 6 4 60 58 5 20 52 6 61 61 7 40 26 8 6 6 9 12 6 10 92 100 11 1 0 12 66 58 13 78 66 14 21 52 Specimen Direct Stratified 15 32 26 16 0 0 17 38 38 18 18 12 19 92 92 20 1 12 21 40 46 22 21 21 23 0 0 24 6 12 25 12 40 26 18 12 27 40 78 Do the data provide sufficient evidence to conclude that the mean number of seeds detected differs for the two methods? Test the relevant hypotheses using ? = 0.05. (Use ?direct − ?stratified.) Find the test statistic. (Round your answer to two decimal places.) t = Find the df. (Round your answer down to the nearest whole number.) df = Use technology to find the P-value. (Round your answer to four…
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9.3.3
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