My Math Forum A question about statistics...

 November 18th, 2012, 02:24 PM #1 Member   Joined: May 2012 Posts: 56 Thanks: 0 A question about statistics... Suppose $X_1, X_2, ... , X_10$ is a random sample on a random variable X which has a Poisson distribution with mean $\theta$. Say the realized value of the sample mean is 0.5, i.e., $n \bar{x}= 5$. Suppose we want to compute the confidence interval ($\bar{\theta}$, $\underline{\theta}$ ). Using the table (for a poisson distribution), show that 0.2 and 0.3 bracket $\underline{\theta}$ and that 0.9 and 1.0 bracket $\bar{\theta}$. 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: $poi(4, 10 \cdot 0.2)$ $poi(4, 10 \cdot 0.3)$ $poi(5, 10 \cdot 0.9)$ $poi(5, 10 \cdot 1.0)$ ...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

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