A 95% confidence interval estimate for the difference between two population means, ?1 - ?2, is determined to be 62.75 < ?1 - ?2 < 68.52. Which of the following is true if the confidence level is reduced to 90%?
A) The confidence interval becomes wider.
B) The confidence interval remains the same.
C) The confidence interval becomes narrower.
D) More information is required to determine the answer.
C
You might also like to view...
An electrical power system consists of four major components with reliabilities of 0.99, 0.90, 0.80, and 0.95. Compute and indicate the overall reliability of the electrical power system.
A. 0.8125 B. 0.9856 C. 0.7645 D. 0.6772
__________is compensation that depends on some measure of individual or group performance or results in order to be awarded.
A. Variable pay B. Merit pay C. Vesting D. Golden parachutes E. Perquisites
Which of the following terms refers to a charge imposed on a charterer when a chartered ship has less than a full load?
A. demurrage B. dead freight C. maritime lien D. straight bill of lading
You have been asked to select at least 3 out of 7 possible sites for oil exploration. Designate each site as S1, S2, S3, S4, S5, S6, and S7. The restrictions are:
Restriction 1. Evaluating sites S1 and S3 will prevent you from exploring site S7. Restriction 2. Evaluating sites S2 or S4 will prevent you from assessing site S5. Restriction 3. Of all the sites, at least 3 should be assessed. Assuming that Si is a binary variable, write the constraint(s) for the second restriction.