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Officials from U.S. Air question how a sample of only 150 flights can prove the average flight delay since there are thousands of U.S. Air flights each month. In a paragraph of at least 6-7 sentences, based on your knowledge and understanding of the concepts of inferential statistics, random sampling, and tests of statistical significance, respond to U.S. Air officials. Be certain to mention what inferential statistics is and why we use it, what is random sampling, which is statistical significance and why we test it.
Mathml equation = $32,000 and mathml equation = $3000. If 100 teachers are randomly selected, find the probability that their mean salary is greater than $32,500.
Determine the mean, median, and range for each of two data sets. b. Determine standard deviation using rule of thumb for each of data sets.
According to T-100 Domestic Market, the top seven airlines in the United States by domestic boardings in a recent year were Southwest Airlines with 81.1 million, Delta Airlines with 79.4 million, American Airlines with 72.6 million, United Airline..
Of 900 consumers surveyed, 414 said they were very enthusiastic about a new home decor scheme. What is the 99% confidence interval for the population proportion?
In a class roster of 18 students, what are the chances that there are at least 2 people with the same birthday (same day, not same year)?
Find the distance between each pair of points. If necessary round answers to two decimal places. Find the midpoint of each line segment with the given endpoints.
Perform an appropriate hypothesis test, showing the necessary calculations and/or explaining the process used to obtain the results.
A researcher wishes to construct a 95% confidence interval for a population mean. She selects a simple random sample of size n=20 from the population.
Define a normal mode of operation when at least two frequencies are working and an emergency mode of operation when at least one frequency is working. Define the event when the system is working as OK.
A particular medical operation proves fatal in 1% of the cases. Find an approximation to the probability that there will be at least 2 fatalities in 200 operations.
A standard deviation of $5000. What is the probability that a randomly selected employee will have a starting salary of at least $31ooo?
At the .05 significance level, is there a difference in gas mileage for the different types of gas? Write out your null and alternative hypotheses for the problem and state what the finding means practically.
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