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Ch 7 Confidence Interval & Sample Size Determination Lab Name: For #1 - 10, use formulas/tables. Label and show inputs to formulas. For problems 11 - 17, use calculator functions where possible, writing functions on lab. Rounding: sample proportion & margin of error - 4 decimal pos., CI limits for proportion - 3 dec. pos., CI limits for mean - 1 dec. pos., percents - 1 dec. pos. To help you with this lab, a sample of a "formulas and tables" lab and a "calculator function" lab are posted above this assignment link, each with steps and complete solutions! Each problem on this lab is worth 6 points except where otherwise stated. 1) How many women must be randomly selected to estimate the mean weight of women in one age group. We want 90% confidence that the sample mean is within 3.2 lb of the population mean, and the population standard deviation is known to be 16 lb. Hint: Use formula for sample size determination. 2) In a random sample of 170 college students, 112 had part-time jobs. Find the margin of error for the 95% confidence interval used to estimate the population proportion. 3) Of 203 employees selected randomly from one company, 20.69% of them commute by carpooling. a) Construct a 99% confidence interval for the true percentage of all employees of the company who carpool. b) Write a statement describing your results. Hint: Review the statements in the example labs that are posted!

          Ch 7 Confidence Interval & Sample Size Determination Lab Name: 
For #1 - 10, use formulas/tables. Label and show inputs to formulas. For problems 11 - 17, use calculator functions where possible, writing functions on lab. Rounding: sample proportion & margin of error - 4 decimal pos., CI limits for proportion - 3 dec. pos., CI limits for mean - 1 dec. pos., percents - 1 dec. pos. To help you with this lab, a sample of a "formulas and tables" lab and a "calculator function" lab are posted above this assignment link, each with steps and complete solutions! Each problem on this lab is worth 6 points except where otherwise stated.

1) How many women must be randomly selected to estimate the mean weight of women in one age group. We want 90% confidence that the sample mean is within 3.2 lb of the population mean, and the population standard deviation is known to be 16 lb. Hint: Use formula for sample size determination.

2) In a random sample of 170 college students, 112 had part-time jobs. Find the margin of error for the 95% confidence interval used to estimate the population proportion.

3) Of 203 employees selected randomly from one company, 20.69% of them commute by carpooling.
a) Construct a 99% confidence interval for the true percentage of all employees of the company who carpool.
b) Write a statement describing your results. Hint: Review the statements in the example labs that are posted!

Ch 7 Confidence Interval Sample Size Determination Lab Name:
For #1 - 10, use formulas/tables. Label and show inputs to formulas. For problems 11 - 17, use calculator functions where possible, writing functions on lab. Rounding: sample proportion margin of error - 4 decimal pos., CI limits for proportion - 3 dec. pos., CI limits for mean - 1 dec. pos., percents - 1 dec. pos. To help you with this lab, a sample of a "formulas and tables" lab and a "calculator function" lab are posted above this assignment link, each with steps and complete solutions! Each problem on this lab is worth 6 points except where otherwise stated.

1) How many women must be randomly selected to estimate the mean weight of women in one age group. We want 90% confidence that the sample mean is within 3.2 lb of the population mean, and the population standard deviation is known to be 16 lb. Hint: Use formula for sample size determination.

2) In a random sample of 170 college students, 112 had part-time jobs. Find the margin of error for the 95% confidence interval used to estimate the population proportion.

3) Of 203 employees selected randomly from one company, 20.69% of them commute by carpooling.
a) Construct a 99% confidence interval for the true percentage of all employees of the company who carpool.
b) Write a statement describing your results. Hint: Review the statements in the example labs that are posted!

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