Problem 20BSC
Genetics and Handedness In a study of lefthandedness as a possible inherited trait, the data in the table below were obtained (based on data from “Why Are Some People LeftHanded? An Evolutionary Perspective,” by Laurens and Faurie, Philosophical Transactions,Vol. 364). Use a 0.01 significance level to test the claim that lefthandedness is independent of parental handedness. What do the results suggest about the inheritability of lefthandedness?
Parental Handedness 
Offspring LeftHanded? 

Father/Mother 
Yes 
No 
Right/Right 
5360 
50,928 
Right/Left 
767 
2736 
Left/Right 
741 
3667 
Left/Left 
94 
289 
Solution 20BSC
We are given a data set of genetics and handedness. We have to test the claim that left handedness is independent of parental handedness.
Step 1: To test the claim we need to fulfil certain assumptions.
1. We assume that the sample has been randomly selected because of the structure of the study.
2. The results are tabulated as frequencies.
3. The expected frequencies are more than five in every column.
Step 2 : We will define hypothesis as below
= Left handedness is independent of parental handedness.
= Left handedness is not independent of parental handedness.