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Macaray Homes is developing two parcels near Globe Arizona. In order to test different advertising approaches, they use different media to reach potential buyers. The mean annual family income for 75 people making inquiries at the first development is $150,000, with a standard deviation of $40,000. A corresponding sample of 120 people at the second development had a mean of $180,000, with a standard deviation of $30,000. At the .05 significance level, can Macaray conclude that the population means are different? Note that you should show all 5 steps in the test of hypothesis.
Listed below are the commissions earned ($000) last year by the sales representatives at the Furniture Patch, Inc.
In recent years, 3.4 children per year get sick with measles in Minnesota. If a recent year is taken at random, what is the probability that:
Determine the cost Xs to develop the support system for which the probability of exceeding Xs is equal to 0.01?
What is the expected number of Republicans who will win office in the coming election?
The lifetime of a light bulb is an Exponential RV with a mean of 800 hours. Let L represent the time (in hours) that one randomly selected light bulb will burn. What is the possibility the light bulb burns for more than 1000 hours.
A study showed that 60% of The Wall Street Journal subcribers watch CNBC every day. Of these, 70% watch it outside the home. Only 20% of those who don't watch CNBC every day watch it outside the home.
It has been reported that 80% of taxpayers who are audited by the Internal Revenue Service end up paying more money in taxes. Assume that auditors are randomly assigned to cases, and that one of the ways the IRS oversees its auditors is to monitor..
Estimate the total number of cases sold along with the standard error of your estimate. Estimate the average number sold per supermarket, along with the standard error of your estimate.
It could not do anything with the airport and suffer a loss of revenue. The current value of raised revenue from a new airport is in question.
Different designs SRS from Normal data, Shape of the population distribution and sample distribution Margin of error doesn"t cover all errors How small a P is convincing?
How many voters required to be sampled to evaluate the proportion within 0.05 with 95% confidence?
Would it be reasonable to conclude that less than 5 percent of the employees are not able to pass the random drug test?
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