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A medical devices company wants to know the number of hours their MRI machines are used per day. A previous study found a standard deviation of four hours. How many MRI machines must the company find data for in order to have a margin of error of at most 0.5 hours when calculating a 98% confidence interval?
What is the probability of obtaining 4 ones in a row when rolling a fair, six-sided die? Interpret this probability.
to test the effect of sample size in a normal distribution with mu100 and sigma12 determine the probability of
Find the density for Z = X + Y. Verify that it integrates to 1. Find the median (the value of z for which P(Z =
The controller of Dash Shoes Inc. instructs you to prepare a monthly cash budget for the next three months. You are presented with the following budget information:
Ages of 56 attendees of a Harry Potter movie are shown. (a) Form seven age classes (10 to 20, 20 to 30, etc.). Tabulate the frequency of attendees in each class.
The prices recorded were $1.36, $1.37, $1.38, $1.39, and $1.40. What is the range, mean price, and the standard deviation of the gasoline?
Find out the probability that the return for common stocks will be more than 0%.
a regression equation was fit to a set of data for which the correlation r between x and y was 0.6. which of the
Normally distributed with mean equal to 15,000 and standard deviation equal to 1000. What is the lowest income among the richest 250 persons?
a company wants to find the average weight of its products. a large initial sample shows the standard deviation of the
Assuming the manufacturer's claim is true, what is the approximate probability of observing a sample mean of 52 months or less?
as an occupational health epidemiologist you are required to measure the effect of stress on the workers in your
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