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The department of transportation wants to estimate the proportion of vehicles on Interstate 35 between the hours of midnight and 5:00 AM that are 18-wheel tractor trailers. Highway department officials counted vehicles at different locations on the interstate for several nights during this time period. Of the 3,481 vehicles counted, 927 were 18-wheelers. (adapted from [Black 2012])
Construct a 99% confidence interval for the proportion of vehicles on I-35 during this time period that are 18-wheelers.
How might this interval be useful to planners in the department of transportation?
1. the diameter of bearing shafts that are manufactured in your factory follow a normal distribution with a mean of 1
Determine and plot the probability mass function and probability distribution function of the contract award amount (in millions of dollars).
In order to conduct testing of the life hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6). 378, 361, 350, 375, 200, 391, 375, 368, 321 What is the variance?
a researcher notes that the correlation in the group she studies is so large that if there were not a correlation among
Conclude that is there a difference in the two amounts?
Compute the Kappa statistic and its standard error regarding reproducibility of the diagnosis of dyspnea in the clinic.
Find out the mean to the nearest whole number, for the following list of numbers: 20, 43, 67, 52, 67, 44, 62, 90, 21, 19, 15
Assume this distribution follows a normal distribution. What is the probability that next week's show will: Have between 29 and 37 million viewers?
assume a normal distribution. draw a well-labeled curve for each part.a. find the z-score that gives a left area
On opening day one season, 10 major league baseball games were played and they lasted the following numbers of minutes. Find the sample variance.
Using the value in the given data table finding the missing values
Using Coefficient of Variation determine in which year do the ages show a more dispersed distribution? Show your complete work and support your answer.
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