Purchase Solution

95 & 90%s Confidence Interval of Voters

Not what you're looking for?

Ask Custom Question

A random sample taken of 1200 likely voters a week before election show that 628 of them plan on voting for Abraham Washington in the upcoming election. Calculate a 95% confidence interval and a 90% confidence interval based on this data. Then state this interval in a single sentence, explaining to Mr. Washington his chances of winning the election.

Purchase this Solution
Solution Summary

The solution examines 90 and 95% confidence intervals for voting data. The solution explains Mr. Washington chance of winning the election.

Purchase this Solution
Free BrainMass Quizzes
Know Your Statistical Concepts

Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.

Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.

Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.

View More Free Quizzes
Related BrainMass Solutions

  • Confidence Interval

    433444 Confidence Interval Conducted for Mean Tears 1.Compute a 95% confidence interval for the mean saline of the tears. You select a random sample of 100 tear drops.

  • Confidence Interval for Population Mean & Proportion

    For a 90% confidence internal, what is the value of t? Develop the 90% confidence interval for the population mean and would it be reasonable to conclude that the population mean is 63 pounds? _____________________ Ms.

  • Confidence Intervals calculations

    3591 Confidence Intervals calculations I randomly selected 200 likely voters and created a 95 percent confidence interval for the true proportion of voters that will vote for my candidate. My confidence interval has endpoints of 0.39 and 0.45.

  • Sample size and confidence interval

    Construct the 95% confidence intervals for p , the true population proportion of crimes in the area in which some type of firearm was reportedly used.

  • Finding the confidence interval for a proportion in an election

    In the second poll, 1285 of 2520 favor the candidate. In the third poll, 1795 of 3500 voters favor the candidate. Find 95% confidence intervals for the proportion of voters in favor of the candidate for all three.

  • Sample Distribution Scenario Questions

    In a random sample of 400 registered voters, 120 indicated they plan to vote for Candidate A. Determine a 95% confidence interval for the proportion of all the registered voters who will vote for Candidate A.

  • Sample size for estimating population proportion

    error is to be less than 5 %) s p=standard error of proportion= square root of (pq/n) Confidence interval = 95% Assuming normal distribution z value corresponding to this confidence = 1.9600 z=(sample proportion-population

  • Estimation: Confidence Intervals and Sample Size

    Sample size: No of tails= 2 This is a 2 tailed test as we are checking the accuracy of plus minus 2% confidence interval= 95% Z corresponding to 95% confidence interval and 2 tailed test is 1.96 (from the tables or using

  • Confidence interval for mean

    ¯x = 24, s = 3, n = 7, 90 percent confidence b. ¯x = 42, s = 6, n = 18, 99 percent confidence c. ¯x = 119, s = 14, n = 28, 95 percent confidence a.

View More Related Solutions