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Statway College 3.2: Confidence Intervals for a Population Proportion TAKE IT HOME 1 During April of 2013, Gallup randomly surveyed 500 adults in the U.S. and 47% said that they were happy, and without a lot of stress. Calculate and interpret a 95% confidence interval for the proportion of U.S. adults who considered themselves happy at that time. A How many successes and failures are there in the sample? Are the criteria for approximate normality satisfied for a confidence interval? B What is the sample proportion? C Compute the margin of error for a 95% confidence interval. D Interpret the margin of error you calculated in Question 1C. Explain what this margin or error tells us in one or two sentences. E Give the lower and upper limits of the 95% confidence interval for the population proportion (p), of U.S. adults who considered themselves happy in April, 2013. F Give an interpretation of this interval. Explain what this interval tells us in one or two sentences.

          Statway College 3.2: Confidence Intervals for a Population Proportion

TAKE IT HOME

1 During April of 2013, Gallup randomly surveyed 500 adults in the U.S. and 47% said that they were happy, and without a lot of stress. Calculate and interpret a 95% confidence interval for the proportion of U.S. adults who considered themselves happy at that time.

A How many successes and failures are there in the sample? Are the criteria for approximate normality satisfied for a confidence interval?

B What is the sample proportion?

C Compute the margin of error for a 95% confidence interval.

D Interpret the margin of error you calculated in Question 1C. Explain what this margin or error tells us in one or two sentences.

E Give the lower and upper limits of the 95% confidence interval for the population proportion (p), of U.S. adults who considered themselves happy in April, 2013.

F Give an interpretation of this interval. Explain what this interval tells us in one or two sentences.

Statway College 3.2: Confidence Intervals for a Population Proportion

TAKE IT HOME

1 During April of 2013, Gallup randomly surveyed 500 adults in the U.S. and 47% said that they were happy, and without a lot of stress. Calculate and interpret a 95% confidence interval for the proportion of U.S. adults who considered themselves happy at that time.

A How many successes and failures are there in the sample? Are the criteria for approximate normality satisfied for a confidence interval?

B What is the sample proportion?

C Compute the margin of error for a 95% confidence interval.

D Interpret the margin of error you calculated in Question 1C. Explain what this margin or error tells us in one or two sentences.

E Give the lower and upper limits of the 95% confidence interval for the population proportion (p), of U.S. adults who considered themselves happy in April, 2013.

F Give an interpretation of this interval. Explain what this interval tells us in one or two sentences.

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