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Independent samples are taken of a random variable X . If the PDF of is uniform over the interval and zero elsewhere, then approximate the density of the sample mean with a normal density, assuming the number of samples is large.
Write the approximation as an equation.
1. the selling prices in thousands of dollars for a sample of 15 recreational vehicles sold by getaway rvs and boats
A new book is being released and a bookstore predicts that 70% of customers that walk through the door on the release day will purchase the book.
A recent report from the American Medical Association claims that for the first time in ten years, the average salary of psychiatrists was greater than $190,000 with a standard deviation of $27,000. What is the null hypothesis for his claim?
1. Restate the question as a research hypothesis and a null hypothesis about the population. 2. Set your significance level at .05 3. Determine the significance level of the sample's ANOVA, which "Sig." identifies exactly.
how does variablity in a population influence standard error of the mean? if you were studying the effect of puppies on
With the sample standard deviation of 12 lbs. Determine the 90% confidence interval of true mean weight of all college wrestlers.
major league baseball salaries averaged 3.26 million with a standard deviation of 1.2 million in 2013. suppose a sample
Suppose n progeny are to be examined, and let P^ be the sample proportion of purple-owered plants. It might happen, by chance, P^ that would be closer to 1/2 than to 9/16. Find the probability that this misleading event would occur if:
In a standard test for reaction time, female candidates for flight school are found to have times that are normally distributed with a mean of 0.65 seconds and a standard deviation of 0.15 seconds.
In light of these data, are the percentages of divorcing couples with prenuptial agreements equal in these four places?
A random sample of 15 AAA batteries produced by this manufacturer lasted a mean of 9.8 hours with a standard deviation of 2.5hours. Find a 90% confidence interval for the population standard deviation of the lifetimes of AAA batteries produced by ..
Describe each set of data with a histogram (use the same class intervals on both histograms) the mean, standard deviation.
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