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7 8
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7+ 8
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Answer to a math question 7+ 8
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7+8=15
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Math question: Factor completely: 2x^3 - 8x^2 + 10x - 40.
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2.3/-71.32
4x/2+5x-3/6=7/8-1/4-x
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We plan to test whether the mean mRNA expression level differs between two strains of yeast, for each of 8,000 genes. We will measure the expression levels of each gene, in n samples of strain 1 and m samples of strain 2. We plan to compute a P-value for each gene, using an unpaired two-sample t-test for each gene (the particular type of test does not matter). a) What are the null hypotheses in these tests (in words)? [2] b) If, in fact, the two strains are identical, how many of these tests do we expect to produce a P-value exceeding 1/4? [2]
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5 1/9 + 2 2/3
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