Quiz ch 19 reviewName
Find the margin of error for the given confidence interval.
1) In a survey of 1200 people, 40% said they got their news online. Find the marginof error for this survey if we want 93% confidence in our estimate of the percent of T.V. viewerswho watch network news programs.
Use the given degree of confidence and sample data to construct a confidence interval for the population proportion.
2) A survey of 535 voters in one state reveals that 408 favor approval of an issue. Construct a 98% confidence interval for the percentage of all voters in the state whofavor approval.
3) When 2302 college students are randomly selected and surveyed, it is found that 836 own a car.Construct a 99% confidence interval for the percentage of all college students who own a car.
4) Of 423 randomly selected students, 43 said that they planned to work for a nonprofit. Construct a 95%confidence interval for the percentage of all medical students whoplan to work for a nonprofit.
Find the margin of error for the given confidence interval.
5) In a survey of 280 adults, 80% said they were eating right. Find themargin of error for this survey if we want a 99% confidence in our estimate of the percent ofadults who areeating right.
6) A recent poll of 1700 new home buyers found that 55% hired a moving company to help themmove to their new home. Find the margin of error for this poll if we want 98% confidence in ourestimate of the percent of new home buyers who hired movers.
II. Find the Z score for the following confidence interval.
1. 70%2. 96%3. 97%4. 82%5. 50%
III. A company claims that 17% of the people who use cell phones in a car have nearly had an accident while on the phone. You have taken a sample of 977 people who use cell phones in a car. 198 people had run a stop sign.
A) What is the Critical Value for a 99% confidence interval?
B) Find the margin of error for a 99% confidence interval.
C) Find the 99% confidence interval.