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Question: Families in the USA have a monthly magazine that discusses issues related to health and health costs. After surveying 23 of their subscribers, it was found that the annual health insurance premiums for a family with coverage through an employer averaged $11,400. The standard deviation of the sample was $1,032.
a) Based on this sample information, develop a 99% confidence interval for the population mean yearly premium. (Round up your answers to the next whole number)
Note: Confidence interval for the population mean yearly premium is between $ and $.
b) How large a sample is needed to find the population mean within $220 at 99% confidence?
The researcher expects a 12-point treatment effect and plans to use a two-tailed hypothesis test with a = 0.05.
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he population consists of all 15 year olds living in the attendance district of a local high school. You plan to obtain a simple random sample of 200 such residents by using the roster of the high school as the sampling frame.
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One of the main measures of the quality of service provided by any organization is the speed with that responds to customer complaints. A large family-held department store selling furniture and flooring, including carpet, had undergone a chief ex..
An auditor reviewed 25 oral surgery insurance claims from a particular surgical office, determining that the mean out-of-pocket patient billing above the reimbursed amount was $275.66 with a standard deviation of $78.11.
Using the 0.05 level of significance, is there evidence that the population mean is above $170?
brief discussion telling why you chose this particular data set to study. As in discussion two, I am hoping that you will choose data that has some relevance to your life.
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A random sample of 48 managers of large hotels has mean X‾= 5.91. The null hypothesis for the researcher's test is?
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