8. You are given the sample mean and the sample standard deviation. Use this information to construct the 90% and the 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. If convenient, use the technology to construct the confidence intervals

 

A random sample of 35 home theater systems has a mean price of $142.00 and a standard is $19.80

Construct a 90% confidence for the population mean:

The 90% confidence interval is

Construct a 95% confidence for the population mean:

The 95% confidence interval is

(Round to two decimals places as needed for both answers)

 9. You are given the sample mean and the sample standard deviation. Use this information to construct the 90% and the 95% confidence intervals for the population mean. Which interval is wider? If convenient, use the technology to construct the confidence intervals

A random sample of 34 gas grills has the mean price of $649.30 and a standard deviation of $58.70

Construct a 90% confidence for the population mean:

The 90% confidence interval is

Construct a 95% confidence for the population mean:

The 95% confidence interval is

(Round to two decimals places as needed for both answers)

 

 

10. You are given the sample mean and the sample standard deviation. Use this information to construct the 90% and the 95% confidence intervals for the population mean. Which interval is wider? If convenient, use the technology to construct the confidence intervals

A random sample of 39 eight-ounce servings of different juice drinks has a mean of 79.4 calories and a standard deviation of 40.7 calories.

 

Construct a 90% confidence for the population mean:

The 90% confidence interval is ______________

Construct a 95% confidence for the population mean:

The 95% confidence interval is ___________

 

11. People were polled on how many books they read the previous year. How many subjects are needed to estimate the number of books read the previous year within one book 95% confidence? Initial survey results indicate that σ=15.1 books.

A 95% confidence level requires _______ subject

 

12. A doctor wants to estimate the HDL cholesterol of all 20- to 29- year old females. How many subjects are needed to estimate the HDL cholesterol within 2 points with 99% confidence assuming σ=17.3? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required?

A 99% confidence level requires __________ subjects

A 90% confidence level requires __________ subjects

 

 8. You are given the sample mean and the sample standard deviation. Use this information to construct the 90% and the 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. If convenient, use the technology to construct the confidence intervals

 

 

A random sample of 35 home theater systems has a mean price of $142.00 and a standard is $19.80

Construct a 90% confidence for the population mean:

The 90% confidence interval is

Construct a 95% confidence for the population mean:

The 95% confidence interval is

(Round to two decimals places as needed for both answers)

 9. You are given the sample mean and the sample standard deviation. Use this information to construct the 90% and the 95% confidence intervals for the population mean. Which interval is wider? If convenient, use the technology to construct the confidence intervals

A random sample of 34 gas grills has the mean price of $649.30 and a standard deviation of $58.70

Construct a 90% confidence for the population mean:

The 90% confidence interval is

Construct a 95% confidence for the population mean:

The 95% confidence interval is

(Round to two decimals places as needed for both answers)

 

 

10. You are given the sample mean and the sample standard deviation. Use this information to construct the 90% and the 95% confidence intervals for the population mean. Which interval is wider? If convenient, use the technology to construct the confidence intervals

A random sample of 39 eight-ounce servings of different juice drinks has a mean of 79.4 calories and a standard deviation of 40.7 calories.

 

Construct a 90% confidence for the population mean:

The 90% confidence interval is ______________

Construct a 95% confidence for the population mean:

The 95% confidence interval is ___________

 

11. People were polled on how many books they read the previous year. How many subjects are needed to estimate the number of books read the previous year within one book 95% confidence? Initial survey results indicate that σ=15.1 books.

A 95% confidence level requires _______ subject

 

12. A doctor wants to estimate the HDL cholesterol of all 20- to 29- year old females. How many subjects are needed to estimate the HDL cholesterol within 2 points with 99% confidence assuming σ=17.3? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required?

A 99% confidence level requires __________ subjects

A 90% confidence level requires __________ subjects
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