Paper Submitted Homework 3.docx

Using α 005 the percentage of emails that are spam

Info icon This preview shows page 11. Sign up to view the full content.

Using  α  = 0.05, the percentage of emails that are spam are not 80%. The null  hypothesis is rejected because p* = 0.0442 which is less than  α d. Using    α = 0.01, the percentage of email that are spam is 80%. The null hypothesis is not rejected because the p-value (p* = 0.0442) is more than  α   14) Consider a sample of 110 women drawn randomly from the membership list of the National  a. Organization for Women (N.O.W.), 25 of whom were found to smoke. Use this result of  the sample to test whether the rate found is significantly different from the United States  proportion of 0.30 for women. Show all steps of the test of hypothesis and use a 0.025  level of significance to make decision. i. Scientific Hypothesis:  The rate found is significantly different from the  United States proportion of 0.30 for women. ii. Null Hypothesis: H0: p = 0. 30, Alternative Hypothesis: H1: p   0.30 iii. z* = -1.6645  iv. p* = 0.0960 v. Do not reject the null hypothesis because p* >   α   vi. Conclusion: There is no sufficient sample evidence to support the claim  that the rate found is significantly different from the United States  proportion of 0.30 for women. 15) It is feared that the smoking rate in young females has increased in several years. In 1985, 38% of the females in the 17- to 24-year age group were smokers. An experiment is to be conducted to  gain evidence to support or refute the increased contention.  a. What is the claim for this problem? Set up the appropriate null and alternative  hypotheses for the specified claim.  i. H0 : p   0.38  ii. H1: p   0.38  b. Suppose that the true value of the percentage of female smokers in the 17- to 24- year age  group is 40%, and the null hypothesis is not rejected. Is this a Type I error, a Type II  error, or a correct decision? Explain your answer.  i. This is considered a Type II error, meaning that the null hypothesis is false but it was not rejected. 
Image of page 11
This is the end of the preview. Sign up to access the rest of the document.
  • Fall '12
  • Todo
  • KRISTA CLEARY

{[ 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