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The distribution of scores on the SAT test is approximately normal with a mean of 510 and a standard deviation of 105. What is the minimum score needed to be in the top 15% on this test?
A radio station must broadcast at exactly 103.1 MHz. In a random sample of 25 days they average 103.8 MHz. The SD at radio stations with similar equipment is .1 MHz. At level of significance a = .05, are they meeting FCC specifications?
The railroad industry's cost structure is different than that of the motor carrier industry. What factors contribute to this difference? What impact do these differences have for the railroads in terms of pricing, competitiveness, and investment?
What is the average duration of trips starting at the Train Station was ___ while the average duration of trips starting at the Library was __
In the following probability model, X represents the number of activities a parent of a 6th-to-8th grade student is involved in.
One thing you have learned is that the tangency portfolio will give you the maximum Sharpe ratio. Consequently, you have constructed such a portfolio. What are you portfolio weights.
Assume that the time required to receive a confirmation that an electronic transfer has occurred is uniformly distributed between 30 and 90 seconds.
Critically illustrate out the properties of a normal distribution. Explain why there are an infinite number of normal distributions.
An article in Financial Analysts Journal discusses results of a regression analysis of average price per share P on the independent variable X/k.
Give a 95% confidence interval for the proportion of all undergraduate students who work 10 or more hours a week during the school year.
Suggest one psychological research question that could be answered by each of the following types of statistical test:
If you randomly selected 7 Reynold's students who first enrolled in the fall of 2015, what is the probability that none of them have graduated?
Construct a 95% confidence interval for the population mean, μ. assume the population has a normal distribution. In a random sample of 26 computers.
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