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1. Does the concept of margin of error make sense if the data in a poll do not come from a random sample? Explain.
2. Write a brief report on what you learned about sampling distributions and margins of error for proportions.
Consider a random variable Y, and a constant theta such that (1/theta)Y is distributed exponentially. Derive the lower and upper bounds for a 90% confidence interval for theta (These will be a function of y). Noe that theta=1/lambda where lambda i..
1. the company believes that it averages about the same weight per bag in each of two production lines. to test this
This was the first time that Carl Schilling had been summoned to meet with the bigwigs in the fancy executive offices upstairs. And he hopes it will be the last time. Carl doesn't like the pressure.
Suppose a particular state allows individuals filing tax returns to itemize deductions only if the total of all itemized deductions is at least $5000. Let X (in 1000s of dollars) be the total of itemized deductions on a randomly chosen form. Assum..
1 % of healthy population tested. If 0:5% of population really has disease, determine the probability that person has disease given that test result is positive.
A sample of 24 is known to come either from a uniform distribution over the interval (0, 10) or else from a symmetric triangular distribution over the same interval (0, 10). The sample values are
determine the number of subgroups needed to establish the central lines and control limits for x and r charts with a
When you choose a place to live, what objectives are you trying to accomplish? What makes some apartments better than others? Would you rather live close to campus or far ther away and spend less money? What about the quality of the neighborhood? ..
The lifetime of zzz batteries are normally distributed with a mean of 270 hours and a standard deviation of 10n hours. Find the number of hours that represent the 40 th percentile.
a normal distribution has a mean of 500 and a standard deviation of 50. a manager wants to simulate one value from this
poor milhouse is hopelessly in love with lisa. unfortunately for milhouse lisa does not feel the same way. however
mileage tests were conducted on a randomly selected sample of 100 newly developed automobile tires. the average tread
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