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Suppose that a highway patrol person wants to estimate the proportion of all drivers speed, and that she wants to be able to assert with probability of at least 0.95 that the error of her estimate will not exceed 0.07. How large a sample, n, will she require if she has no idea what the true proportion is.
What is the probability that the total weight of eight people exceeds 1300 pounds? 1500 pounds? (Assume that the probability distribution is approximately normal).
A professor is targeting a score of 80 on an exam. His forty-nine students averaged 78 on an exam with s = 7. Are the scores significantly less than 80 at a significance level of 0.05? Show your work and state the conclusion.
What would be the minimum sample needed to estimate the population mean of the length of carrots using Gro-Haut to within 1.5 cm with 99% confidence?
Given that SAT test scores are normally distributed with a mean of 1000 and a standard deviation of 200, what is the lowest possible score a student needs to qualify for acceptance into the university?
Generate a 95% CI for the difference in proprotions of particpants reportinga reduction of symptoms between the experimental and placebo groups.
f no more than 5% of the containers are to weigh less than 15.8 oz, what must the standard deviation of the weights equal?
The following table lists the annual amounts of glass cullet produced by Kimble Glass Works, Inc. Determine the least squares trend equation. Estimate the amount of scrap for the year 2005.
When a researcher has two samples with two means, one of the assumptions for two samples is independence of between the two samples. What does this mean? What happens if the independence assumption is violated?
The animal colony in the reseach department contains 20 male rats and 30 female rats. Of the 20 males, 15 are white and 5 spotted. Of the 30 females, 15 are white, and 15 are spotted.
For an examination in which grades of 70 and 88 correspond to standard scores of -0.6 and 1.4 respectively. Find:
What is the coefficient of determination, and wat is its meaning?
The nation health department has concerns with the chlorine level of 0.4% mg/mL at a local water park raises to unsafe level.
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