(Answered) If a and b are disjoint pa 04 and pa or b09if the variance

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If A and B are disjoint, P(A) =0.4 and P(A or B)=0.9

If the variance for a data set is zero, then all the observations in this data set must be zero.

There may be more than one mode in a data set .

A 98% confidence interval is wider than a 95% confidence interval of the same parameter

In a two tailed test, the value of the test statistic is 2. The test statistic follow a distribution with the distribution curve shown is the area is 0.03, than we have sufficient evidence to reject the null hypothesis @ 0.05 level of significance.

Are these statement true or false and I would like to justify my answer.

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