Confidence interval of the true mean
The winning team's scores in 5 high school basketball games were recorded. If the sample mean is 10.5 points and sample standard deviation is 0.25 points, find out the 98% confidence interval of the true mean.
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A random sample of 300 local wage as well as salary workers showed that 50 belonged to the union. At a=0.05, is there sufficient evidence to conclude that the proportion of union membership differs from 13.7%?
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A sample of 31 European countries found that variance on life expectancy was 5.2 years. Determine the 99% confidence interval for the variance of life expectancy in Europe?
A report states that 46% of home owners had a vegetable garden. How large a sample is required to determine the true proportion of home owners who have vegetable gardens to within 3% with 99% confidence?
A food snack manufacturer samples seven bags of pretzels off the assembly line as well as weighed their contents. If the sample mean is 10.4 and the sample standard deviation is 0.15, find out the 95% confidence interval of the true mean.
A study of 100 white mice showed that their average weight was 5.2 ounces. The standard deviation of population is 0.6 ounces. Which of the following is the 99% confidence interval for mean weight per white mouse?
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