1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: A question about statistics

  1. Nov 18, 2012 #1
    Suppose [tex]X_1, X_2, ... , X_10[/tex] is a random sample on a random variable X which has a Poisson distribution with mean [tex]\theta[/tex]. Say the realized value of the sample mean is 0.5, i.e., [tex]n \bar{x} = 5[/tex]. Suppose we want to compute the confidence interval [tex] (\bar{\theta}, \underline{\theta})[/tex]. Using the table (for a poisson distribution), show that 0.2 and 0.3 bracket [tex]\underline{\theta}[/tex] and that 0.9 and 1.0 bracket [tex]\bar{\theta}[/tex]. If R is available, us the R function poissonci.r to compute the solutions ot the equations.

    I want to use R, but I'm not sure how...

    I tried to put the commands:

    [tex]poi(4, 10 \cdot 0.2)[/tex]
    [tex]poi(4, 10 \cdot 0.3)[/tex]
    [tex]poi(5, 10 \cdot 0.9)[/tex]
    [tex]poi(5, 10 \cdot 1.0)[/tex]

    ...because that's what they do in my textbook. But, for some reason, I don't know how to type the dot (between 10 and 0.2 for example) in R...

    So can anybody help me please?

    Thanks in advance
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted