Chi square test help

D

dbzstr42

Guest
#1
For my lab assignment, I was to determine the effects of temperature on the swim speed of brine shrimp. I did ten trials for each temperature and counted how many time the arm flaps of the brine shrimp moved within a time span of 30 seconds for each trial. Here is my data.



10 Deg C: 53 68 72 72 73 73 74 76 72 75
21 Deg C: 63 67 84 83 98 85 87 90 84 86
30 Deg C: 112 113 108 117 112 118 124 118 120 127


I was told that i must do a Chi square test, but when i did I got a completely inaccurate answer. My questions are. how am i to perform a chi square test using this data? how do i find the expected value? Do I have to perform multiple chi tests for each variable? I'm not looking for someone else to do it for me, just looking for some guidance. any help will be appreciated.

Thank you
 
A

amilsan

Guest
#2
I am new in this kind, but there is need of expected values for chi test, plus i think the variable is only one (T), so this is my prop

If the expected values would be given by the expression:

(x-10) (x-10)^2 / (x*2!) + (x-10)^3 / (x*3!) + 70

f(x=10) = 70 (or 0+70)
f(x=20) = 76.33
f(x=30) = 108.44

only for the range 10 to 30

I did the Chi test with 0.05 and 28 (41.33)
vs
(oi-ei)^2 / ei = 33.025
the ei s were given by the f(x) from above

I still have my doubts if that is correct

edited:
the degrees are now 2 (#values) and max 19 (range), that gives 5.99 and 30.14, but the last still needs more data
the sum of the expected is 29.99 (not 33.025)
 
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