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To develop a 90 percent confidence interval for the population mean.
Families USA, a monthly magazine that discusses issues related to health and health costs, surveyed 20 of its subscribers. It found that the annual health insurance premiums for a family with coverage through an employer averaged $10,979. The standard deviation of the sample was $1,000.
a. Based on this sample information, develop a 90 percent confidence interval for the population mean yearly premium.
b. How large a sample is needed to find the population mean within $250 at 99 percent confidence?
Determine the probability that the project will be completed in 80 days or less.
About what percent of the observations lie between 55 and 65?
Impact on sampling of increasing sample size is: The potential for extreme sampling error is reduced.
A small town has a population of 20,000 people. Among these 1,000 regularly visit a popular local bar. A sample of 100 people who visit the bar is surveyed for their annual expenditures in the bar.
At the .01 significance level, is there a difference in the use of the four entrances?
Make a histogram showing the probabilties of r = 0, 1, 2, 3, 4, 5, 6, 7 or 8 defective syringes in a random sample of 8 syringes.
Create a 95% confidence interval for true mean debt for student borrowers.
Her results (in hours until turning a particular shade of brown) are in the table below. At ∞= .01, did she see a difference between the two treatments?
Write down the name of 4 parts of the regression equation.
For any distribution the score that separates the highest 10% from the rest of scores is called.
At the .01 significance level, can we conclude that there is more variation in the selling prices of the oceanfront homes?
The mean top of knee height of a sitting mate is 20.7 in.
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