Review answers exam 3 - Exam 3 Review Answers(For problem...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Exam 3 Review Answers (For problem 1-2). For a person to have the mathematics skills to balance a checkbook, a person must have a score of 275 or more on the NAEP math test. Suppose researchers have concern that the population average is less than 275. They take a random sample of 100 individuals and find a sample mean of 270 with a standard deviation of 50. They wish to use this data to test the hypotheses H 0 : μ = 275, H a : μ < 2 75 where μ is the mean exam score of the population. 1. 6 pts. What is the value of the Z-statistic for doing the test of hypothesis? Choose the option closest to the correct value. a. -1.28 *b. -1.0 c. 0.1. z = 100 50 275 270 = -1.0 2 . 4 pts. What conclusion do we reach at the 5% level of significance? *a. There is not enough evidence to show that the population mean is less 275 b. The mean score of the population is significantly less than 275. 3 . 6 pts. The Chamber of Commerce claims that the mean yearly income of residents of a certain city is $38,000 per person. A chain store is considering locating in the city and wants to know whether this is correct. They plan to take a random sample of residents to test the hypotheses H 0 : μ = $38,000, Ha: μ ≠ 38,000 where μ is the average income of the population. Suppose it turns out that Z = 2.10. What is the p-value?
Image of page 1

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

View Full Document Right Arrow Icon
Image of page 2
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