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There are two major tests of readiness for college, the ACT and the SAT. ACT scores are reported on a scale from 1 to 36. The distribution of ACT scores for more than 1 million students in a recent high school graduating class was roughly normal with mean μ = 15.7 and standard deviation σ = 6.5. SAT scores are reported on a scale from 400 to 1600. The SAT scores for 1.4 million students in the same graduating class were roughly normal with mean μ = 957 and standard deviation σ = 192.
Jose scores 842 on the SAT. Assuming that both tests measure the same thing, what score on the ACT is equivalent to Jose's SAT score?
Mean 1400 grams and standard deviation 20 grams. Find positive numbers a and b such that Y=a+bX has a mean 0 and standard deviation.
A data source generates hexadecimal characters. Let X be the integer value corresponding to a hex character. Suppose that the four binary digits in the character are independent and each is equally likely to be 0 or 1.
In an article in the Journal of Management Information Systems, Mahmood and Mann investigate how information technology (IT) investment relates to company performance.
The quality-control inspector of a production plant will reject a batch of syringes if two or more defective syringes are found in a random sample of eight syringes taken from the batch. Assume the batch contains 1% defective syringes.
With any statistical model, we assess the fit: Does the model accurately depict the truth? Explain how one of the following helps assess the "fitness" of the mean.
Explain the results plot the original data and the fitted regression equations.
Differentiate between a point estimate and an interval estimate for a population parameter. What is necessary for an interval estimate to be a confidence interval?
Write a brief statement of purpose of the study. Define the population. State the hypotheses for the study. Select an a value
What is the probability that Susan passes on the first try? What is the probability that Susan first passes on the second try?
What is the 95% confidence interval estimate for the difference between the mean reflectivity reading for Paint A and Paint B? Please complete the blank: "we can be 95% confident that the true difference between the actual means is?
Select the suitable hypothesis.H 0 : π ≥ .052; H 1 : π 0 if z
Indicate at which point flat-of-curve medicine is experienced in the following example (imagine that antibiotics have been prescribed for a given population of 1,000 elderly persons).
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