Guided Homework Confidence Intervals Guided homework #1 1. Three hun.docx

This preview shows page 1 - 3 out of 3 pages.

Image of page 1

Subscribe to view the full document.

Guided Homework: Confidence Intervals Guided homework #1 1. Three hundred 8th graders were given an IQ test. The mean of their scores was 103.6 with a standard deviation of 4.8. Assume that the scores were normally distributed and give a confidence level of 99% for the true population IQ mean. 2. The weights (in grams) of Hershey's Kisses are normally distributed. A sample of 100 Kisses has a mean weight of 8.2 grams with a standard deviation of 1.2 grams. a. What is the margin of error for the 90% confidence interval? b. What is a 90% confidence interval for the mean weight of the Kisses? c. What are you 90% confident about? (What happens 90% of the time?) d. What is a 99% confidence interval for the mean weight of the Kisses? 3. A random sample of 32 nails have the following lengths in centimeters: 7.65 7.04 7.9 7.81 7.55 7.48 7.01 7.73 7.877.417.44 7.92 7.5 7.777 .34 7.62 8.02 7.85 7.227.44 8.057.517.6 7.15 7.666.98 7.327.68 8 7.45 7.91 7.13 Assume that the lengths are normally distributed. What is a 95%
Image of page 2
Image of page 3
  • Fall '19

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

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes