THE GENE ACTNZ encodes & protein that functions in fast- twitch muscles . People can be classified according to which genotype of this gene they Have , RR, RX, Or *x, and Else according to
which genetic allele they have , For*`. The study' described here , examines the association between this gene and different subgroups of the population . All participants in the study' live*
in Australia . THE Earlier Exercises only included the control group .
Testing Genotypes For Fast - Twitch Muscles*
The study on genetics and fast- twitch muscles includes a sample of Elite sprinters , a sample of elite endurance athletes , and a control group of non- athletes . Is there an association
Between genotype classification [RR, RX, or *`` and group ( sprinter , Endurance , control group ) ? Computer output is shown for this chi- square test . In each cell , the top number is the
observed count , the middle number is the Expected count , and the bottom number is the contribution to the chi- square statistic .
RR
RX
Total
XX
Control
130
226
80
136
143. 76
214. 15
78.09
1. 316
0. 655
0. 047
Sprint
5:3
40
6
107
35.2
52.56
19.16
8.901
0. 395
9.043
Endurance
0.9
40
194
6:3.96
95.29
34. 75
0. 246
0. 558
3. 6:45
Total
243
362
132
737
Chi - 59 = 24. 8:05 , DF = 4, P- Value = 0.000
( a); What Is the expected count for sprinters with the RRgenotype ? For this cell , what Is the contribution to the chi- square statistic ?"
Round your answer for the expected count to two decimal places , and your answer for the contribution to the chi- square statistic to three decimal places .
Expected count _
Contribution to the chi- square statistic _^
I'D'; What are the degrees of freedom for the test ?
If =