{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Econ 203 Hmwk 6 - Graded Homework 6 You have submitted this...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Graded Homework 6 You have submitted this Homework 1 time (including this time). You may submit this Homework a total of 40 times and receive full credit. The first three problems cover inference for two populations assuming equal variances between populations, or case 2 of 3 in the course packet, covering pages 53-55. The last three problems ask you to apply the difference in means test assuming unequal variances; case 3 of three which you can find in your course packet on pages 55-56. For now, we tell you that this is the proper assumption, and hence the proper test to conduct. Before long, we will develop a formal testing procedure which you will use to make this determination on your own. When calculating degrees of freedom, round to the nearest integer, so that 122.6 would be 123 and 198.1 would be 198. (It would be more correct to round down; but this is how Excel's add-in does it, so we do it this way to be consistent with Excel's add-in; otherwise you could get different answers depending on whether you used the add-in or calculated the degrees of freedom yourself and used TDIST.) Question #1 This question is based on example #1 on slide 4 (page 54) of your course packet. Furniture World is a manufacturer of office furniture. They have come out with a new computer desk, and have asked their factory manager for a job design to get it produced. She has narrowed it down to two possibilities; Design A (population 1) , and Design B (population 2) . She gathered samples of 25 for each design type. Data can be found here . You can assume production time variances are equal. Is either design quicker? Note that this question is identical to example #1 on slide 14, page 44 of the course packet. What is the relevant point estimate? .272 = 0.272 What is the value of the test statistic? .9273 = 0.9273
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
This test statistic has A standard normal distribution A t distribution A chi-squared distribution What is the p-value for this test? . 35839 = 0.35839 Allowing for a 10% chance of a Type I error, what is your conclusion for this test? Reject the null hypothesis; therefore, there is not enough evidence to conclude that one design is quicker than the other one. Do not reject the null hypothesis; therefore, there is not enough evidence to conclude that one design is quicker than the other one. Do not reject the null hypothesis and conclude that one design is quicker than the other one. Reject the null hypothesis and conclude that one design is quicker than the other one. Construct a 95% confidence interval for the difference in production time between design A and design B. Use the TINV function to get the t-value. For help, look at pages 156 and 157 of the course packet. So, just type =TINV(0.05, d.f.) in excel to get the t-value you need. The LCL and the UCL are: -.3176 = -0.3176 and .8616 = 0.8616 Item 3: You made all of the correct selections.
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern