Two phenotypes appear in an experiment in the ratio 16: 4 (a) How well does this
ID: 26360 • Letter: T
Question
Two phenotypes appear in an experiment in the ratio 16: 4 (a) How well does this sample fit a 3:1 ratio? Would a sample with the same proportional deviation fit a 3:1 ratio if it were (b) 10 times larger than (a), (c) 20 times larger than (a)?1. (a) X2 = 0.27; p = 0.5 - 0.7 acceptable; (b) X2 = 2.67; p = 0.1 - 0.2 acceptable; (c) X2 = 5.33; p = 0.01 -0.05 not acceptable,
2. None of these
3. (a) X2 = 0.27; p = 0.5 - 0.7 acceptable; (b) X2 = 4.27; p = 0.1 - 0.2 acceptable; (c) X2 = 9.33; p = 0.01 -0.05 not acceptable,
4. (a) X2 = 1.50; p = 0.5 - 0.7 not acceptable; (b) X2 = 2.67; p = 0.1 - 0.2 not acceptable; (c) X2 = 5.33; p = 0.01 -0.05 not acceptable,
5. (a) X2 = 0.27; p = 0.5 - 0.7 acceptable; (b) X2 = 4.27; p = 0.1 - 0.2 not acceptable; (c) X2 = 9.33; p = 0.01 -0.05 not acceptable,
Explanation / Answer
CATEGORY
observed
expected
deviation
d^2
d^2/e
3/4
160
¾ x200=150
+10
100
100/150=0.67
1/4
40
¼ x200=50
-10
100
100/50=2.00
200
200
0
=2.67
Because . 10<p< .20 acept null hypothesis that fits a 3:1
====================================
0 times larger than (a)?
CATEGORY
observed
expected
deviation
d^2
d^2/e
3/4
320
¾ x400=300
+20
400
400/300=1.33
1/4
80
¼ x400=100
-20
400
400/100=4.00
400
400
0
=5.33
Because .01<p<0.05 reject null hypothesis that fits a 3:1
CATEGORY
observed
expected
deviation
d^2
d^2/e
3/4
160
¾ x200=150
+10
100
100/150=0.67
1/4
40
¼ x200=50
-10
100
100/50=2.00
200
200
0
=2.67
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