1.There are 2560 brown and 630 white rats. As an expert statistician, you are al
ID: 3126188 • Letter: 1
Question
1.There are 2560 brown and 630 white rats. As an expert statistician, you are also able to use X^2 analysis to answer the question.
1. what is the hypothetical ratio for your X^2 test?
2. What is the calculated chi-square value in your test? (show work)
2. you have an aquarium with 10 fish of different colors. You decide to only catch 6 fish at a time. Calculate the number of different fish color combinations that could be made utilizing 6 fish at a time.
3. Heterozygous black guinea pigs (Bb; B=black, b=white) are crossed among themselves. What is the probability among 3 offspring of producing 2 white and 1 black in any order?
What is the probability that 2 white and 1 black offspring will be produced in that specific order? (I know the answer for this is one is 3/64 but I'm not sure how it was solved)
Explanation / Answer
1question
Let the hypothetical ratio be 4:1
total rats = 2560+630 = 3190
Brown
White
n
Expected
2552
3190
Observed
630
X2 = sum ( O – E )2 /E
O = observed value of each class of data
E = expected value of each class of data
X2 = 82 / 2552 + 82 / 638
X2 = 0.1253
Critical value pobability =.28 Refer = http://stattrek.com/online-calculator/chi-square.aspx
Well with a P value of 0.25<P<0.50 the Chi-square test reveals that there is a pretty good probability that chance could be responsible for the experimental results. This means that our experimental results agree with the predicted outcome.
Question 2
10 different color fishes. 6 to catch at same time
combinations = 10C6 = 10*9*8*7/ (4*3*2) =210
Question 3
Possible types : 25 % BB , 25% bb , 50% Bb
black = 75%
white = 25%
2 white and one black in particular order = .25 *.25 *.75 = 3/64
in any order = 3* 3/64 = 9/64
Brown
White
n
Expected
2552
6383190
Observed
2560630
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