# Chi-Square Test

1. Nov 2, 2005

### jena

Hi,
My Question:
Problem 1. The expected phenotypic ratios for each of the crosses below is 1:1. Determine whether the observed ratios are differ significantly (p < 0.05) from the expected.
View attachment Table 1.doc
I used a Chi Square test to help me determine that answer and found the there is no probability of any of them correct.
•Let’s first examine white eyed females to red-eyed males
o We found that X2: Results
o 2 data/expectation pairs (x,E):
( 225. , 433.0 ); ( 208. , 433.0 );
o chi-square = 217.
degrees of freedom = 1
probability = 0.000 ​
• Next we examined Red-eyed females to eosin eyed males
o We found that X2: Results
o 2 data/expectation pairs (x,E):
( 679. , 1426. ); ( 747. , 1426. );
o chi-square = 715. degrees of freedom = 1 probability = 0.000 ​
• Finally we examined Eosin-eyed females to white eyed females
o We found that X2: Results
o 2 data/expectation pairs (x,E):
( 694. , 1273. ); ( 579. , 1273. );
o chi-square = 642.
degrees of freedom = 1
probability = 0.000 ​