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Two airlines are randomly sampled to compare the porportion of on-time flights. out of 300 flights, 73% of the flights at A were ontime, while B had 82% of 250 flights on time. find a 95% confidence interval for the difference in the proportions. Find the a value for the weighted estimate of p and perform a 2 sample proportion test. If Type I error = .05, can we conclude there is a difference? How is that answer related to the confidence interval that was found?
During the last year sales averaged $22,000 per month. Does this indicate that monthly sales have changed (in a statistically significant sense)? Use 0.05. Assume monthly sales are normally distributed.
The following table gives the approximate age distribution in the United States from the 2000 census.
in a random sample of visitors to a famous tourist attraction 84 of 250 men and 156 of 250 women bought souvenirs
Is there evidence that the population mean is above $300, if X (bar) = $305.11 and s = $43.20?
The length of country and western songs is normally distributed and has a mean of of 170 seconds with a standard deviation of 49 seconds. find the probabality that a random collection of 16 songs will have a mean of 158.30 seconds or less?
Suppose two-tailed test, state hypotheses (Ho and H1 ) for two-tailed test. Using symbols, define hypotheses (Ho and H1) for two-tailed test.
Using What's Best! (or Solver) determine the least-cost shipping schedule, where each of three (3) hardware vendors provide up to two hundred (200) units and each of six (6) buyers demand one hundred (100) units.
1. you earned a 7.1 nominal rate of return on your investments over the past year. but at the same time the reported
This shuttle component functions successfully provided that at least one of the n systems functions properly. Find the probability that this shuttle component functions successfully if n - 2.
suppose you decide to take a sample of size 2 n2 by rolling a die twice. produce a histogram representing the sampling
Based on the following results, is LIFO more effective in keeping the value of his inventory lower? Product FIFO LIFO. What is the null hypothesis?
In a specific company, there are three levels of workers: skilled, unskilled, and manager. The owner of this company wants to know if the level of job satisfaction differs amongst the three levels of workers.
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