Confidence interval for two population proportion

Assignment Help Basic Statistics
Reference no: EM1313071

Newsweek magazine (September 19, 1983) reported results of a poll to investigate whether there was a difference between the percentage of women and the percentage of men who approved of the way Ronald.

Reagan was handling his job as president. Of 511 women interviewed, 40% indicated approval. Of 507 men, 49% indicated approval.

a. Find a 90% confidence interval for the difference between the proportion of men and the proportion of women who approved of Reagan's performance. What assumption do you make to use this method?

b. Interpret the interval obtained in part (a). Can you conclude that there is a gender gap?

Reference no: EM1313071

Questions Cloud

Course of evolution : The "Primordial soup" includes the mixture of elements and gases which are thought to have started life on the Earth. Speculate on how, over the course of evolution, these complex molecules would eventually form the complex life forms such as human..
Sample mean-hypothesis test : The number of standard errors that the sample estimate (p 1  - p 2 ) of (p1 - p2) falls from its null hypothesis value of zero is called
Evaluate price elasticity of demand : Calculate the price elasticity of demand for the product below using average values for the prices and quantities in your formula.
Cells and complex molecules : The "Primordial soup" includes the mixture of elements and gases which are thought to have started life on the Earth. Based upon what you have learned related to the cells and complex molecules, do you feel this theory makes sense?
Confidence interval for two population proportion : Find a 90% confidence interval for the difference between the proportion of men and the proportion of women who approved of Reagan's performance. What assumption do you make to use this method?
Origination of gases and elements : The "Primordial soup" includes the mixture of elements and gases which are thought to have started life on the Earth. Specify where did the gases and elements come from?
Chi-square test-independence of attributes : Give all steps of a test of the hypothesis that the corresponding population proportions are equal.
Miller and ureys experiment : The "Primordial soup" includes the mixture of elements and gases which are thought to have started life on the Earth. Describe Miller and Urey's experiment.
Evaluation of average collection period : Evaluation of Average collection period over the next year - what amount will this increase in the average collection period increase the financing needed by the company over the next year?

Reviews

Write a Review

 

Basic Statistics Questions & Answers

  Absolute percentage error

Would you expect the mean absolute percentage error to be more than or less than 0.25? Describe.

  Formulating the null and alternative hypotheses

Formulate the null and alternative hypotheses for this application.

  Testing the claim using single mean z test

Does this sample indicate a smaller average? Use α = 0.05 and assume a normally distributed population.

  Find the confidence interval for the mean

How strong is the evidence against the company's claim? Based on these data, the P -value of the appropriate test

  Calculating the probability values

What is the probability that all tree students pick a different card?

  Variance using given probability distribution

What are the expected value and variance of the following probability distribution?

  The mean and standard deviation for the process

We are establishing a quality control program for a process and need to establish the mean and standard deviation for the process. The first 10 batches had samples of size 5 taken.

  Explaining two-tailed two-sample and chi-square

As it is a 2 _ 2 table, try also two-tailed two-sample z test for ð1 = ð2 and verify that z2 is same as your chi-square statistic. Which test do you favour? Describe why?

  Value of the test statistic

Compute the value of the test statistic (to 2 decimals).

  Confidence and estimated standard deviation

If the estimate is to be within 8 mpg of the true mean with 98% confidence and the estimated standard deviation is 22 mph, how large a sample size must be taken?

  Condition in standard deviation

Sample data recently collected indicate that Dough Boy's crusts average 30 centimeter in diameter, with a standard deviation of 1.1 centimeters.

  Multiple linear regression model - anova table

This model is fit to the data using the method of least squares using statistical software, and the following ANOVA table is obtained

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd