Questions from Statistics Principles

Q: A researcher wishes to estimate the proportion of households that have broadband

A researcher wishes to estimate the proportion of households that have broadband Internet access. What size sample should be obtained if she wishes the estimate to be within 0.03 with 99% confidence i...

Q: The city of Naperville is considering the construction of a new commuter

The city of Naperville is considering the construction of a new commuter rail station. The city wishes to survey the residents of the city to obtain their opinion regarding the use of tax dollars for...

Q: An urban economist wishes to estimate the proportion of Americans who own

An urban economist wishes to estimate the proportion of Americans who own their homes. What size sample should be obtained if he wishes the estimate to be within 0.02 with 90% confidence if (a) he use...

Q: A researcher for the U.S. Department of the Treasury

A researcher for the U.S. Department of the Treasury wishes to estimate the percentage of Americans who support abolishing the penny. What size sample should be obtained if he wishes the estimate to b...

Q: A school administrator is concerned about the amount of credit-card

A school administrator is concerned about the amount of credit-card debt that college students have. She wishes to conduct a poll to estimate the percentage of full-time college students who have cred...

Q: A television sports commentator wants to estimate the proportion of Americans who

A television sports commentator wants to estimate the proportion of Americans who follow professional football. What sample size should be obtained if he wants to be within 3 percentage points with 95...

Q: A sociologist wishes to conduct a poll to estimate the percentage of

A sociologist wishes to conduct a poll to estimate the percentage of Americans who favor affirmative action programs for women and minorities for admission to colleges and universities. What sample si...

Q: In a Gallup poll, 64% of the people polled answered

In a Gallup poll, 64% of the people polled answered yes to the following question: “Are you in favor of the death penalty for a person convicted of murder?” The margin of error in the poll was 3%, and...

Q: In a Gallup Poll, 44% of the people polled answered

In a Gallup Poll, 44% of the people polled answered “more strict” to the following question: “Do you feel that the laws covering the sale of firearms should be made more strict, less strict, or kept a...

Q: CNN polled 702 likely voters immediately preceding the 2018 Arizona senate race

CNN polled 702 likely voters immediately preceding the 2018 Arizona senate race. The results of the survey indicated that Kyrsten Sinema had the support of 51% of respondents, while Martha McSally had...