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A significance test is used to prevent a machine from under filling or overfilling quart bottles. On the basis of a sample, the null hypothesis is rejected and the machine is shut down for inspection. A thorough examination reveals there is nothing wrong with the filling machine. From a statistical standpoint, was there a "type" error made? If yes, which type? Explain.
Is it reasonable to conclude that this set of n = 16 people is not a representative sample of registered voters?
Assume we have a population of scores with mean (mu) of 200 and standard deviation (sigma) of 10. Assume that the distribution is normal. Provide answers to the following questions:
Which trend model is best, and why? If none is satisfactory, explain. (e) Make a forecast for 2004 by using a trend model of your choice or a judgment forecast.
In recent year, of the 109,857 arrest fro federal offenses, 29.1% were for drug offenses. Use a .01 significance level to test the claim that the drug offense rate is equal to 30%.
PiggyBank has narrowed its options down to two incentive plans: A. cash back when the consumer makes an online purchase; and B. cash back when the consumer makes a purchase at a clothing store. The bank doesn't know whether consumers would shop on..
Basic concepts. For each of the following, answer the question and give a short explanation of your reasoning.
The Bunte Auto Repair Shop received a shipment of four carburetors. One is known to be defective. If two are selected at random and tested.
The Sony corporation produces a Walkman that requires two AA Batteries. The mean life of these batteries in this product is 35.0 hours. The distribtion of the battery lives closely follows the normal probability distribtion with a standard deviati..
In a sample survey, 200 of 800 individuals enrolled in our managed-care organization indicated that they favored a proposal to extend office hours from 5:00 to 8:00 p.m. Construct a 95% confidence interval for the corresponding true proportion.
Create a 98 percent confidence interval for the population mean.
To find out the estimate of between and within treatments.Samples were selected from 3 populations. The data obtained follow.
A competitive school requires an applicant to have an IQ score in the top 10% of adults. What is the cutoff score?
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