# Statisitcs: Confidence Intervals and Errors:

posted by .

Confidence Intervals and Errors:
An opinion poll asks 1500 randomly chosen United States residents their opinions
about relations with the nations of Europe. The announced margin of error for 95%
confidence is + 3 points. But some people were not on the list from which
respondents were chosen, some could not be contacted, and some refused to answer.
Does the announced margin of error include errors from these causes? Explain

## Similar Questions

1. ### Statistics:Significance Test and Confidence Interv

Significance Test and Confidence Intervals In General: The article contains a 95% confidence interval. Would the margin of error in a 99% confidence interval computed from the same data be less, the same, or greater?
2. ### statistical applications

In the media, numerous surveys are often displayed reporting percentages or proportions. A margin of error is often reported in the survey and this is used to calculate confidence intervals. Why is it important to create/report confidence …
3. ### Statistics

Compare the 95% and 99% confidence intervals for the hours of sleep a student gets. Explain the difference between these intervals and why this difference occurs. 95% confidence intervals: 6.214, 7.686 99% confidence intervals: 5.944, …
4. ### Statistics

Compare the 95% and 99% confidence intervals for the hours of sleep a student gets. Explain the difference between these intervals and why this difference occurs. 95% confidence intervals: 6.214, 7.686 99% confidence intervals: 5.944, …
5. ### Statistics

1000 scientists create 95% confidence intervals for parameters of interest. If they all compute the confidence intervals correctly, how many of the intervals would we expect to contain the true population parameter?
6. ### Statistics

In a survey of 633 males ages 18-64, 395 say they have gone to the dentist in the past year. Construct 90% and 95% confidence intervals for the population proportion. Interpret the results and compare the widths of the confidence intervals. …
7. ### Statistics

Direct mail advertisers send solicitations (that is "junk mail") to thousands of potential customers in the hope that some will buy the company's products. The response rate is usually quite low. Suppose a company wants to test the …
8. ### Statistics

An opinion poll asks a random sample of 100 college seniors how they view their job prospects. In all, 53 say "Good." The 95% confidence interval has a margin of error of 9.9%. The sample used actually included 130 college seniors …
9. ### Stastics

Which of the following descriptions of confidence intervals is correct?
10. ### math

THERE ARE ESTIMATES OF THE MARGIN OF ERROR FOR CONFIDENCE LEVELS OTHER THAN 95%. FOR A 90% CONFIDENCE LEVEL AND A SAMPLE SIZE N, THE MARGIN OF ERROR IS APPROXIMATELY 82/N%.SUPPOSE WE WISH TO HAVE A MARGIN OF ERROR OF 1% WITH A 90% …

More Similar Questions