# Shared Flashcard Set

## Details

Poultry Breeding Chapter 5
Poultry Breeding Chapter 5
16
Agriculture
01/12/2018

Term
 X2
Definition
 chi-square
Term
 Chi-Square Test
Definition
 A test used to evaluate how closely observed results fit expectations.
Term
 procedure for doing a chi-square test
Definition
 1: State a null hypothesis (H0). 2: Calculate your test statistic (X2). 3: Degrees of freedom (df). 4: Statistical significance (p).
Term
 null hypothesis (H0)
Definition
 states that the observed results will be the same as the expected resultsneeds to be tested
Term
 how to calculate the test statistic (X2)
Definition
 X2 = Σ ((O-E)2/E)
Term
 Degrees of freedom (df).
Definition
 number of classes-1
Term
 Statistical significance (p).
Definition
 the probability, p of obtaining the observed results if the null hypothesis is true
Term
 A generally accepted p for acceptance or rejection of a hypothesis
Definition
 5% (0.05)
Term
 alternative hypothesis (HA)
Definition
 hypothesis that states that there is a difference between observed and expected
Term
 when to accept the null hypothesis
Definition
 when X2 is within the range on the table for the degree of freedom
Term
 when to reject the null hypothesis
Definition
 when X2 is not within the range on the table for the degree of freedom
Term
 contingency table
Definition
 basically a table that shows relationship between two events
Term
 The Null Hypothesis for a contingency table
Definition
 to test whether the frequencies of observations in the rows are independent of the frequencies of the observations in the columns.
Term
 example of a contingency table
Definition
 [image]
Term
 how to calculate expected numbers in a contingency table
Definition
 here's an example:(# of males / total population) * (# of specific variable) = expected number for that variable(# of females / total population) * (# of specific variable) = expected number for that variable
Term
 how to calculate d.f. in a contingency table
Definition
 (# of R's - 1) * (# of C's - 1) = d.f.
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