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Suppose a 95% confidence interval for obtained from a random sample of size 13 is (3.5990,...

Suppose a 95% confidence interval for obtained from a random sample of size 13 is (3.5990, 19.0736). Find the upper bound of a 90% confidence interval for (round off to the nearest integer).

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Suppose a 95% confidence interval for obtained from a random sample of size 13 is (3.5990,...
Suppose a 95% confidence interval for obtained from a random sample of size 13 is (3.5990, 19.0736). Find the upper bound of a 90% confidence interval for (round off to the nearest integer).
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What is the minimal sample size needed for a 95% confidence interval to have a maximal...
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