Statistics Homework Solutions 138

Statistics Homework Solutions 138 - 138 CHAPTER 6 1 60...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
138 CHAPTER 6 (c) Yes, the P -value is small, so we conclude that μ 35. 5. (a) X 61 3, s 5 2, n 12. There are 12 1 11 degrees of freedom. The null and alternate hypotheses are H 0 : μ 60 versus H 1 : μ 60. t 61 3 60 5 2 12 0 866. Since the alternate hypothesis is of the form μ μ 0 , the P -value is the area to the right of t 0 866. From the t table, 0 10 P 0 25. A computer package gives P 0 202. We cannot conclude that the mean concentration is greater than 60 mg/L. (b) X 61 3, s 5 2, n 12. There are 12 1 11 degrees of freedom. The null and alternate hypotheses are H 0 : μ 65 versus H 1 : μ 65. t 61 3 65 5 2 12 2 465. Since the alternate hypothesis is of the form μ μ 0 , the P -value is the area to the left of t 2 465. From the t table, 0 01 P 0 025. A computer package gives P 0 0157. We conclude that the mean concentration is less than 65 mg/L. 7. (a) 3.8 4 4.2 (b) Yes, the sample contains no outliers. X 4 032857, s 0 061244, n 7. There are 7 1 6 degrees of freedom.
Image of page 1
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