Find the mean and variance for the random variable
The 2009 GRE has 200 questions with 3 possible answers and only one of which is correct. For a candidate who guesses at all answers, find the mean and variance for the random variable X, the number of correct answers.
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(a^2), (1-a)^2 and 2a(1-a) are the relative frequency for the outcomes genotype S1, S2 and S3 respectively where "a" is the gene frequency.
A statistical association may be causal or noncausal. In addition, many diseases require that more than one factor be present for disease to develop.
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A statistician is considering using a 99% confidence interval for a study instead of a 95% confidence interval. What happens to the required sample size if the confidence level is increased from 95% to 99% and the same error is required in each ca
For a candidate who guesses at all answers, find the mean and variance for the random variable X, the number of correct answers.
What have the presidents justified under the principles of "immediate needs of the nation" and "a mandate from the people?"
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There are 3 gene types S1, S2 and S3 in a large population. They each have the relative frequency of a^2, 2a(1-a) and (1-a)^2 respectively where "a" is the gene frequency. Suppose that in a random sample of size n, there x1, x2 and x3 of the three
Do you think that this sample might have come from a normal population? Why or why not?
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