5 s a storm. (1) (38.2, 41.8) (3) (31.5, 48.5) (4) (30.4, 45.1) normal random va

Question

5 s a storm. (1) (38.2, 41.8) (3) (31.5, 48.5) (4) (30.4, 45.1) normal random variable, the area between 0.0 and 1.50 compared to the area (2) (38.5, 41.5) 21. If z is a standard between 1.5 and 3.0 will be (1) the same (2) larger (3) smaller (4) None of the above 2 22. An unbiased estimator is: (1) any sample statistic used to approximate a population parameter (2) a sample statistic, which has an expected value equal to the value of the population parameter (3) a sample statistic whose value is usually less than the value of the population parameter (4) any estimator whose standard error is relatively small 23. Given that z is a standard normal random variable, P(-1.2szs 1.5) is (3) 0.3849 (1) 0.8181 (4) 0.5228 (2) False (2) False (2) 0.4772 The error ofestimation is the distance between an estimate and the estimated parameter. 24· (1) True 25. Numerical descriptive measures calculated from a sample are called statistics (1) True

Explanation / Answer

Sol:

P(-1.2<z<1.5)

P(Z<1.5)-P(Z<-1.2)

=0.9332-(1-P(Z<1.2)

=0.9332-(1-0.8849)

=0.9332-0.1151

=0.8181

ANSWER:0.8181

OPTION(1)

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