SOLUTION: (a) A is an event, and Ac is the complement of A, then P(A OR Ac ) = 0. (b) If the variance of a data set is 0, then all the observations in this data set must be identical. (c)

Question 1052921: (a) A is an event, and Ac is the complement of A, then P(A OR Ac ) = 0.
(b) If the variance of a data set is 0, then all the observations in this data set must be identical.
(c) If a 95% confidence interval for a population mean contains 1, then the 99% confidence interval for the same parameter must contain 1
(d) When plotted on the same graph, a distribution with a mean of 60 and a standard deviation of 5 will look more spread out than a distribution with a mean of 40 and standard deviation of 8.
(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.
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
F a)P(A OR Ac ) = PA) + P(Ac)
T b) Variance = Sum of (x-�)^2
T c) 99% confidence interval Larger. Critical value Larger
ME =
= CI z = value
90% z =1.645
92% z = 1.751
95% z = 1.96
98% z = 2.326
99% z =
F d) SD determines the spread. Larger SD has larger spread
T e) .03 < .05
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