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Internet sites referenced

Internet sites often vanish or move, so that references to them can't be followed. In fact, 16% of Internet sites referenced in major scientific journals are lost within two years after publication.

If a paper contains 9 Internet references, what is the probability (±0.0001) that all 9 are still good two years later? Assume that the internet sites are independent of each other.

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## Q : Determine hypothesized value

Determine the sample size needed to reject Ho if the ratio is 3 times the hypothesized value of 2 variances, alpha = 0.05, beta = 0.10, R=3.