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A sample of 1300 computer chips revealed that 28% of the chips fail in the first 1000 hours of their use. The company's promotional literature states that 25% of the chips fail in the first 1000 hours of their use. The quality control manager wants to test the claim that the actual percentage that fail is different from the stated percentage. Find the value of the test statistic. Round your answer to two decimal places.
An agent for a residential real estate company in a suburb located outside a major city has the business objective of developing more accurate estimate
describe the sign test. what types of hypotheses is it used to test? what is the underlying
What two IQ scores separate the extreme 1 percent of the population from the middle 99 percent? Set this problem up using the "extreme 5 percent" example as a model.
A produce manager wants to estimate the mean size of coke bottle fills with 95 percent confidence. A preliminary sample of 12 bottles shows a sample standard deviation of 3 mil, and mean of 500.
What are some reccomendations for contracts and procurement management for the new royal adelaide hospital to ensure successful
a proportion of a college basketball teams season ticket holders renew their tickets for the next season. let p denote
The article "The Lead Content and Acidity of Christchurch Precipitation" (N. Zeal. J. of Science, 1980: 311- 312) reports the accompanying data on lead concentration (mg/L) in samples gathered during eight different summer rainfalls:
The 97.5% CI for mean changes in Group B minus mean change in Group A is (-4.7 to -0.9). Suppose we want to compute a two-sided p-value to compare the two groups.
Answer these three questions and show all your work and use the z-table that is in the back of all statistic book 1) Suppose you know that adult female height is normally distributed and the mean is 65 inches with a std dev of 1.2 inches. What is th..
2007 randomly selected adults were asked if they are in favor of or against cloning. The following table gives the responses.
What percentage of the pins will be acceptable to the consumer? In order to improve percentage accepted, the production manager and the engineers discuss.
Explain the research hypothesis. Describe your sample and your sampling method.
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