There are 3 questions, please give me some explaination 1. A box contains ticket
ID: 3318578 • Letter: T
Question
There are 3 questions, please give me some explaination
1.
A box contains tickets labeled with the numbers {4, 2, 0, 3, 5}. In 100 random draws with replacement from the box, the SE of the sum of just the negative numbers on the tickets drawn is closest to
2.
An investigator performs a test of significance on his data, and finds that the Pvalue is 2%, and the z-score is about 2.2. This means that
(a) the probability of seeing a more extreme z-score than 2.2, assuming that the null is true, is 2%. (b) the probability that the null hypothesis is true, given the observed data, is 2%.
(c) Neither of the above.
3.
Our genetic material, DNA, is formed from a 4 letter ”alphabet” of bases: A,T,G,C (adenine, thymine, guanine, and cytosine). The order in which the letters are arranged is important, but because a molecule can move, there is no difference between a sequence and the same sequence reversed. For example, the sequence (A,T,A,G,A,T) is the same as the sequence (T,A,G,A,T,A). (In reality, DNA molecules have identifiable ends, but ignore that in this problem.) The number of distinct DNA sequences of 6 bases is:
Explanation / Answer
1)
2)
a) the probability of seeing a more extreme z-score than 2.2, assuming that the null is true, is 2%. is correct
3)
first calculate the number of combinations of bases you can get, that's 4^6. Since palindromes don't count you can subtract the number of palindromes from 4^6. The number ofpalindromes is just the number of distinct sequences of 3 bases which is 4^3. So I guess the # of distinct non palindromic sequences is 4^6-4^3 which is 4032. I suppose if you ignore the directionality of DNA then the reverse sequence is the same as the original sequence in which case you need to divide 4032 by 2. You then add the number of palindromes, 4^3 or 64 to that number to get 2080 distinct 6 nucleotide sequences.
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