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A box of crayons comes with 4 colors: black, pink, purple, and green. According to the manufacturer, the color ratio in each production batch is 40% black, 30% pink, 15% purple, and 15% green. To test this claim, 500 crayons from 10 randomly selected boxes were sorted by color. The results were as follows
black: 180
pink: 170
purple: 80
green: 70
Does the observed data contradict the company's claim? Formulate and test the appropriate hypotheses at the 2.5% level of significance. Use the critical value approach
based on information from the rocky mountain news a random sample of 12 winter days in denver gave a mean pollution
A sample of 84 golfers showed that their average score on a particular golf course was 89.05 with a standard deviation of 3.47.
The actual tracking weight of a stereo cartridge that is set to track at 3 g on a particular changer can be regarded as a continuous rv X with pdf
Using your result obtained in g, derive for each sample in your population of samples (cf., result obtained in d) a 90% confidence interval.
Sketch the areas under the standard normal curve over the indicated intervals, and find the specified areas.
Many people have misconceptions about how profitable small, consistent investments can be. In a survey of 1010 randomly selected U.S. adults
He cheats! A friend of yours claims that when he tosses a coin he can control the outcome. You are skeptical and want him to prove it.
If np ≥ 5 and nq ≥ 5, estimate P (more than 5) with n=14 and p=0.3 by using the normal distribution as an approximation to the binomial distribution; if np
Construct the confidence interval for the population mean, µ, if c = 0.99.
according to the 2010 us census approximately 19.4 of persons aged 65 or over live in the northeast 22.4 in the midwest
historically a bank expects about 5 of its borrowers to default not repay. the bank currently has 250 loans
In a study of how managers attempt to manage earnings, researchers analyzed a sample of 515 earnings- management attempts from a survey of experienced auditors. The frequency of effects is summarized in the table shown. Research question: At α..
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