Calculus and Above

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Question 1 Assume you’ve administered...

Question 1

Assume you’ve administered a worker satisfaction test to a random sample of 25 workers at your company. The test is purported to have a population standard deviation or σ of 4.50. The test results reveal a sample mean (x̅) of 78. Based in that information, develop an estimate of the mean score for the entire population of workers, using a 95% confidence interval.

Question 2

The mean for the math component of the New Century Achievement Test is reported as 100, with a standard deviation (σ) of 15. A sample of 400 students throughout a particular school district reveals a mean (x̅) score of 110. Estimate the mean score for all the students in the district, using a 99% confidence interval.

Question 3

A sample of 25 program participants in an alcohol rehabilitation program are administrated a test to measure their self-reported levels of alcohol intake prior to entering the program. Results indicate an average (x̅) of 4.4 drinks per day for a sample of 25, with a sample standard deviation (s) of 1.75 drinks. Based on that information, develop a 95% confidence interval to provide an estimate of the mean intake level for the entire population of program participants (μ).

Question 4

Results from a sample of 400 high school dropouts throughout the state reflect that 13% of the dropouts plan to return to school next year. Using a 99% confidence interval, estimate the percentage throughout the state planning to return to school next year.

Question 5

A poll, based upon a national sample of 750 potential voters and focused on attitudes toward Social Security reform, indicates that 73.55% of the respondents oppose a proposal that would extend the minimum retirement age. Using a 95% confidence interval, estimate the proportion of opposition throughout the population of potential voters.

Assume you’ve administered a worker satisfaction test to a random sample of 25 workers at your company. The test is purported to have a population standard deviation or σ of 4.50. The test results reveal a sample mean (x̅) of 78. Based in that information, develop an estimate of the mean score for the entire population of workers, using a 95% confidence interval.

Question 2

The mean for the math component of the New Century Achievement Test is reported as 100, with a standard deviation (σ) of 15. A sample of 400 students throughout a particular school district reveals a mean (x̅) score of 110. Estimate the mean score for all the students in the district, using a 99% confidence interval.

Question 3

A sample of 25 program participants in an alcohol rehabilitation program are administrated a test to measure their self-reported levels of alcohol intake prior to entering the program. Results indicate an average (x̅) of 4.4 drinks per day for a sample of 25, with a sample standard deviation (s) of 1.75 drinks. Based on that information, develop a 95% confidence interval to provide an estimate of the mean intake level for the entire population of program participants (μ).

Question 4

Results from a sample of 400 high school dropouts throughout the state reflect that 13% of the dropouts plan to return to school next year. Using a 99% confidence interval, estimate the percentage throughout the state planning to return to school next year.

Question 5

A poll, based upon a national sample of 750 potential voters and focused on attitudes toward Social Security reform, indicates that 73.55% of the respondents oppose a proposal that would extend the minimum retirement age. Using a 95% confidence interval, estimate the proportion of opposition throughout the population of potential voters.

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