Question: You have administered a worker satisfaction test to a random sample of 25 workers. The test is purported to have a population standard deviation of

You have administered a worker satisfaction test to a random sample of 25 workers. The test is purported to have a population standard deviation of 4.5The test results reveal a sample mean of 78. What is an estimate of the mean scores for the entire population of workers, using a 95% confidence interval.

A random sample of 29 visitors to a civic art fair indicates an average amount of money spent per person (Xbar) of $38.75, with a s ample standard deviation of $6.33. Please develop a 99% confidence interval to provide an estimate of the mean expenditure per person for the entire population of visitors.

An opinion poll from a random sample of 250 residents indicates that 61% are in favor of a local civic redevelopment project.What is the real level of support throughout the community, based on a 95% confidence interval?

Assume that the mean of a distribution of test scores is 76, with a standard deviation of 5. You've been told that your score is 1.5 standard deviations above the mean. What is your score and where is your relative stand?

How much area under the normal curve is between the mean and a Z value of 2.35?

What percentage of area (cases or observations) is above a Z value of 2.58?

What percentage of area under the normal curve is below a Z value of -1.12?

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