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The mean annual cost of automobile insurance is 900 assume that the standard deviation is 245. What is the probability that a simple random sample of automobile insurance policies will have a sample mean within 25 of the popluation mean for each of the following sample sizes 30,50,100, and 400?
Construct the 95% confidence interval for the proportion of students with at least one injury.
Four properties are randomly selected from each neighborhood and the ratios recorded for each as follows:
he Department of Motor Vehicles (DMV) can service customers at a rate of 20 per hour (or 1/3 per minute) when it comes to license renewals. The service time follows an exponential distribution.
Advertising coefficient is 200 and t stat is 1.75. Which of the following statements is an accurate interpretation of the situation when using an alpha of .10
What is Dutch book argument for the first axiom of probability (the one that says that the probability of a sentence is never less than 0 or more than 1)?
A random sample of 1440 current job applicants results in 61 failures (based loosely on data from the American Management Association).
The main purpose of this exercise is to check your understanding of significance level, p-values and power .
Calculate the sample correlation coefficient by hand. By use of a spreadsheet calculate the sample correlation coefficient.
The winning team's score in 13 high school basketball games was recorded. If the sample mean is 54.3 points and the sample standard deviation is 11.0 points, find the 98% confidence interval of the true mean.
At the end of the Halloween Festival the organizers estimated that a family of participants spent in average $50.00 with a standard deviation of $15.00. If 49 participants (49 = size of the sample) are selected randomly, what's the likeihood that ..
An occupational health study was carried out to evaluate the health status of workers. The response is forced expiratory volume (FEV), a measure of respiratory function
Processing an order for more disks cost $15. Zip uses 60000 disks annually, and the company has a 25% cost of capital. (a) Find the optimal order quantity.
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