A survey conducted five years ago by the health centre at a university showed that 18% of the students smoked at the time. This year a new survey was conducted on a random sample of 200 students from this university, and it was found that 40 of them smoke. a) State the population proportion. b) Determine the sample proportion for students who did not smoke. c) Do these data provide convincing evidence to suggest that the percentage of students who smoke has changed over the last five years

A survey conducted five years ago by the health centre at a university showed that 18% of the students smoked at the time. This year a new survey was conducted on a random sample of 200 students from this university, and it was found that 40 of them smoke. a) State the population proportion. b) Determine the sample proportion for students who did not smoke. c) Do these data provide convincing evidence to suggest that the percentage of students who smoke has changed over the last five years

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section11.4: Collecting Data

Problem 6E

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