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Question: The U.S. Department of Transportation defines an airline flight as being on time if it lands less than 15 minutes after the scheduled time shown in the carriers computerized reservation system. Cancelled and diverted flights are counted as late. A study of the 10 largest U.S. domestic airlines found Southwest Airlines to have the lowest proportion of late arrivals, at 0.1577 (Extracted from N. Tsikriktsis and J. Heineke, The Impact of Process Variation on Customer Dissatisfaction: Evidence from the U.S. Domestic Airline Industry, Decision Sciences, Winter 2004, 35(1), pp. 129 142). Suppose you were asked to perform a follow-up study for Southwest Airlines in order to update the estimated proportion of late arrivals. What sample size would you use in order to estimate the population proportion to within an error of
a. ±0.06 with 95% confidence?
b. ±0.04 with 95% confidence?
c. ±0.02 with 95% confidence?
the guidance system of a ship has four modules that must maintain all function properly for the system to work. two of
The standard deviation of test scores on a certain achievement test is 11.4. A random sample of 100 scores on this test had a mean of 71.2. Based on this sample, find a 90% confidence interval for the true mean of all scores. Complete the below:
Determine the probability distribution associated with these data.
How many months must be sampled for analysis to be 99% confidence that the error in estimating the average monthly price of gasoline is at most $0.03.
Test the claim by the owner of a large dealership that the mean time of ownership for all cars is less than 6.5 years. Use a 0.05 significance level
two inspectors review the quality of a manufactured component and classify the items as good repairable and scrap. each
1.a company wants to know if minorities are more likely to be in certain job categories than others. their data base
(a) Fit a logistic regression model to the response variable y. Use a simple linear regression model as the structure for the linear predictor. (b) Is the logistic regression model in part (a) adequate?
according to a website about salaries the national average salary as of october 2003 for a human resources clerk was
Construct a 99% confidence interval estimate of the population mean amount of paint in a 1-gallon can.
Perform hypothesis testing on one variable's data (choose either the intrinsic or extrinsic Job Satisfaction)using 25 as our data set number.
Find the expected value and standard deviation of your prospective winnings.- You play twice. Find the mean and standard deviation of your total winnings.
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