Purchase Solution

Perform a two-tailed test comparing response rates

Not what you're looking for?

Ask Custom Question

Please review

10.5 A 20-minute consumer survey mailed to 500 adults aged 25-34 included a $5 Starbucks gift certificate. The same survey was mailed to 500 adults aged 25-34 without the gift certificate. There were 65 responses from the first group and 45 from the second group. (a) Perform a two-tailed test comparing the response rates (proportions) at α = .05. (b) Form a confidence interval for the difference of proportions, without pooling the samples. Does it include zero?

10.18 Are women's feet getting bigger? Retailers in the last 20 years have had to increase their stock of larger sizes. Wal-Mart Stores, Inc., and Payless ShoeSource, Inc., have been aggressive in stocking larger sizes, and Nordstrom's reports that its larger sizes typically sell out first. Assuming equal variances, at α = .025, do these random shoe size samples of 12 randomly chosen women in each age group show that women's shoe sizes have increased? (See The Wall Street Journal, July 17,2004.) ShoeSize1
Born in 1980: 8 7.5 8.5 8.5 8 7.5 9.5 7.5 8 8 8.5 9
Born in 1960: 8.5 7.5 8 8 7.5 7.5 7.5 8 7 8 7 8

Attachments
Purchase this Solution
Solution Summary

Perform a two-tailed test comparing response rates of women shoe sizes. The confidence intervals for the different proportions are examined.

Solution Preview

I have attached the solution.

10.5 A 20-minute consumer survey mailed to 500 adults aged 25-34 included a $5 Starbucks gift certificate. The same survey was mailed to 500 adults aged 25-34 without the gift certificate. There were 65 responses from the first group and 45 from the second group. (a) Perform a two-tailed test comparing the response rates (proportions) at α = .05. (b) Form a confidence interval for the difference of proportions, without pooling the samples. Does it include zero?

Test of the proportions
Probability of first group for their response =
Probability of second group for their response =
(a) For ...

Purchase this Solution
Free BrainMass Quizzes
Transformational Leadership

This quiz covers the topic of transformational leadership. Specifically, this quiz covers the theories proposed by James MacGregor Burns and Bernard Bass. Students familiar with transformational leadership should easily be able to answer the questions detailed below.

Motivation

This tests some key elements of major motivation theories.

Accounting: Statement of Cash flows

This quiz tests your knowledge of the components of the statements of cash flows and the methods used to determine cash flows.

Business Ethics Awareness Strategy

This quiz is designed to assess your current ability for determining the characteristics of ethical behavior. It is essential that leaders, managers, and employees are able to distinguish between positive and negative ethical behavior. The quicker you assess a person's ethical tendency, the awareness empowers you to develop a strategy on how to interact with them.

Team Development Strategies

This quiz will assess your knowledge of team-building processes, learning styles, and leadership methods. Team development is essential to creating and maintaining high performing teams.

View More Free Quizzes
Related BrainMass Solutions

  • Starbucks 20-Minute Consumer Survey Statistical Analysis

    (a) Perform a two tailed test comparing the response rate (proportions) at a = .05 (b) Form a confidence interval for the difference of proportions, without pooling the sample. Does it includes zero? Please see the attached file.

  • Evaluating Researcher's Claim using a Two-Tailed T-Test

    497123 Evaluating Researcher's Claim using a Two-Tailed T-Test A researcher is interested in comparing the response times of two different cab companies. Companies A and B were each called at 50 randomly selected times.

  • AIU - Testing of Hypothesis (Job Satisfaction)

    Perform a t-test by formulating a null and an alternative statement, choosing an acceptable significance value, selecting the test statistic and determining its value from the sample data, comparing the observed value to the critical value obtained and

  • Hypothesis testing of Mean: Five step method

    From your t distribution table and for df = 25, note whether the following t scores are significant at the alpha = .05 level for a one-tailed test; a two-tailed test. a. t = -1.316 b. t = +.316 c. t = -2.660 d. t = 1.87 5.

  • T test for assembly times

    129424 Perform a one-tailed test A personal computer manufacturer is interested in comparing assembly times for two keyboard assembly processes.

  • Two Sample Hypothesis Tests

    (a) Perform a two-tailed test comparing the proportion of brand-loyal customers at alpha = .05. (b) Form a confidence interval for the difference of proportions, without pooling the samples. Does it include zero?

  • Step-wise answer to Testing of hypothesis problems

    Perform a two-tailed test. Then fill in the table below.

  • Student's t test

    a). Use the t test to conduct a one-tailed test of the null hypothesis, alpha = .05, comparing male salaries to female salaries. What can you conclude? b). Would your conclusion have been different if you had used a two-tailed test?

  • Correlation, Regression, and Comparing Means

    State if you are using a one or two-tailed test and why. c. Write up the results in APA style and interpret them. 4. Regression.

View More Related Solutions