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An opinion poll asks a sample of 500 adults (an SRS) whether they favor giving parents of school-age children vouchers that can be exchanged for education at any public or private school of their choice. Each school would be paid by the government on the basis of how many vouchers it collected. Suppose that in fact 45% of the population favor this idea. ?What is the mean of the sampling distribution of , the proportion of adults in samples of 500 who favor giving parents of school-age children these vouchers?
?What is the standard deviation of?
?Explain why you can use the formula for the standard deviation of in this setting.
In order to test to see if there is any significant difference in the mean number of units produced per week by each of three production methods, the following data were collected:
If 60 percent of those people chewing the gum are successful in stopping smoking, what is the probability that in a group of four smokers using the gum at least one quits smoking?
What is the null hypothesis in a chi-squared test of independence? List the assumptions under which the linear regression model is supposed to work.
Find the critical value for t and determine the null and alternate hypothesis.
You are asked by the owner of the Starshine Motel to develop a customer satisfaction survey to determine the percentage of customers who are dissatisfied with service.
Delivery time over twenty delivery days was 8.6 hours. At the 0.05 level of significance, test whether the software package has reduced the average time it takes to complete deliveries.
The overall average for the samples is 17 ounces. The range is only 0.5 ounce. Determine the upper and lower control-chart limits for averages for the boxes of cereal.
What is the maximum likelihood estimate of μ? What is an approximate standard error of the maximum likelihood estimate?
The mean driving time is 35 minutes with a standard deviation is 10 minutes. What is the 98 percent confidence interval for the population mean?
At a recent meeting of educational researchers comparison were made between the type of college freshmen attend and the numbers who drop out.
From a population of cereal boxes marked "12 ounces," a sample of 81 boxes is selected and the contents of each box is weighed. You want to test whether the population mean is different from 12 ounces.
For the most recent year available the mean annual cost to attend a private university in the US was $26,889. Assume the distribution of annual costs follows a normal probability distribution and the standard deviation is $4,500. 95% of all studen..
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