Environmental Science

We are using Chi Squares to understand if descrepancies in aniaml populations are random or significant. On the developed land, 20 traps were set. 7 Road runners were caught, and two were marked. On the Undeveloepd land, 20 traps were also set, but 11 Road Runners were caught and 1 was marked. I know the formula for the chi square, x^2=sigma (observed-expected)^2/expected. But which values are observed, and which are expected? And how do the marked values fit into this?

  1. 👍 0
  2. 👎 0
  3. 👁 36

Respond to this Question

First Name

Your Response

Similar Questions

  1. statistics

    Suppose we take a random sample of size n from a normal population with variance, σ2 . It can be shown that (n−1)s2/σ2 has a chi-square distribution with n−1 degrees of freedom, where s is the sample variance. Below is a

    asked by sandy on March 18, 2013
  2. Statistics

    True or False 1. Chi square tests of independence and homogeneity are both usually right-tailed tests. 2. A chi square goodness-of-fit test is appropriate for determining whether a random number generator is truly random.

    asked by Graciela on March 7, 2011
  3. grid problem (geometry)

    The squares of a 2×60 chessboard are coloured black and white in the standard alternating pattern. At random, exactly half of the black squares are removed from the board. The expected number of white squares that have no

    asked by john on June 15, 2013
  4. Mathematics

    The squares of a 2×60 chessboard are coloured black and white in the standard alternating pattern. At random, exactly half of the black squares are removed from the board. The expected number of white squares that have no

    asked by Steve on June 16, 2013
  5. Biology

    How do you find chi squared? and how do you find the expected values for chi squared? I understand the formula but i conducted the experiment and it doesnt give me the theoretical value of it?

    asked by masha on October 14, 2007
  6. Statistics

    In a particular chi-square goodness-of-fit test there are four categories and 200 observations. The significiance level is 0.05. How many degrees of freedom are there? What is the critical value of chi-square? compute the value of

    asked by Rhonda Moore on June 21, 2010
  7. math

    What does it mean to have two matrix variables written vertically inside parentheses? In other words, if A and B are matrices, what does this mean (imagine there is one set of parentheses spanning both rows): (A) (B) I'm trying to

    asked by sergei on January 7, 2009
  8. cells:easy

    in an aniaml cell,what does the microfilament do?

    asked by Brooke on March 15, 2008
  9. Math (Probability)

    Four players are playing a game involving choosing squares on a grid of size 3×8. Each player chooses a random square on the grid, then all players reveal their choices and a token is placed in the center of each of these

    asked by Bob on May 6, 2013
  10. Stats (Chi-Square)

    Suppose you have a chi-squars GOF test to test null hypothesis that the age distribution of drivers stopped in 2003 for traffic violations is the same as the age distr. in 2002. You compute chi-square= 14.7. At the 5% significance

    asked by Graciela on March 3, 2011

More Similar Questions