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Inv 5.3.2 Extra Practice Margin of Error

Last updated about 5 years ago

7 Nsɛmmisa

Hyɛ no nsow a efi ɔkyerɛwfo no hɔ:

margin of error

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1.

A doctor noticed that many female patients were vitamin D deficient. She chooses a random sample of 45 medical files of female patients and finds that 37 of them are vitamin D deficient. Calculate the values of p-hat and the margin of error. Include all calculations to support your final answer.

4

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2.

Tim Allen is running for mayor of a city with a voting population of approximately 250,000. Tim pays a polling company to survey voters to find what proportion of all voters plan to vote for him. The polling company surveys 500 voters and finds that 236 voters plan to vote for Tim. Calculate the values of p-hat and the margin of error. Include all calculations to support your final answer.

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5.

According to a new survey conducted by Dimensional Research, 86% said buying decisions were influenced by negative online reviews. 1500 people were surveyed. How many people in the sample said their buying decisions were influenced by negative online reviews? Calculate the margin of error. Include all calculations to support your final answer.

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6.

When polled recently, 76% of 2,000 respondents said that their bedroom is their top priority when doing a major housecleaning. How many people in the sample responded that their bedroom is their top priority when doing a major housecleaning? Calculate the margin of error. Include all calculations to support your final answer.

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7.

26% of 1,000 school-aged kids admit that they only wash their hands at school when they look dirty. How many of the kids in the sample responded that they only wash their hands at school when they look dirty? Calculate the margin of error. Include all calculations to support your final answer.

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3.

A recent poll of city workers across the U.S. determined that 71% of these workers are unhappy or disengaged with their jobs. A group of Stats students went down to Wilmington and polled 180 city workers for their opinion and found that 122 of them are unhappy or disengaged with their job. Calculate the values of p-hat and the margin of error. Include all calculations to support your final answer.

Asemmisa {{asɛmmisaAhyɛnsode}}

4.

A new survey of 2,100 people shows that 27% of Americans have read an e-book in the past twelve months. How many in the sample of 2,100 people have read an e-book in the past twelve months? Calculate the margin of error. Include all calculations to support your final answer.