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(a) If A and B are disjoint, P(A) = 0.4 and P(B) = 0.5, then P(A OR B) = 0.9.
(b) If the variance for a data set is zero, then all the observations in this data set must be identical.
(c) There may be more than one mode in a data set.
(d) A 90% confidence interval is wider than a 95% confidence interval of the same parameter.
(e) In a right-tailed test, the value of the test statistic is 2. The test statistic follows a distribution with the distribution curve shown below. If we know the shaded area is 0.03, then we have sufficient evidence to reject the null hypothesis at 0.05 level of significance.
If not, what is the relationship between the percentile of the sum and the sum of percentiles? For what per- centiles is the roll-up procedure valid in this case?
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Write the statistical model that is the foundation for this analysis. Also include a description of all assumptions
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