confsumhandout - Confidence intervals scenarios and data 1...

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

View Full Document Right Arrow Icon
Confidence intervals: scenarios and data 1. σ known A candle making process is known to produce candles whose life times have a variance of 0.4 hours. However, the average lifetime is un- known. The lifetimes of a random sample of six candles turned out to be 8.1, 8.7,9.2,7.8,8.4,9.4 hours respectively. Find a 99% confidence interval for the population mean. 2. σ unknown, n small, non-Normal An experiment was performed to de- termine whether two different forms of iron (Fe 2+ and Fe 3+ ) are retained dif- ferently in the body. If one form were retained better, it would be the better dietary supplement. The investigators divided 36 mice randomly into two groups of 18 each; one group was given Fe 2+ and the other Fe 3+ at the same concentration. The iron was administered orally; it was radioactively labelled so that a radiation counter could measure the amount administered and the amount retained after a fixed amount of time had elapsed. The percentage of iron retained is listed for each mouse below. Obtain a 95% confidence interval
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