some solutions for Exercises-from-Chapter7 - MAT121 SPRING...

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MAT121, SPRING 2015SOME PROBLEMS-SOLUTION(BY A. BOURHIM)A printed copy of this file can not be usedduring Test4 and the final exam. It is foryou to practice and prepare for Test 4 andthe final exam.1
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MAT121, SPRING 2015SOME PROBLEMS-SOLUTION3
Ex. 2:Based on a sample of randomly selected SU-students, a 95% confidence in-terval for the proportion of all students who have a car is given by(0.320 , 0.420).(1) Find the point estimatebpand the margin errorE.(2) Find the sample size.Answer:
4(BY A. BOURHIM)From a simple random sample of 1000 SU-students, 400 of them said thatthey like statistics. Construct 95% confidence interval for the proportion of allSU-students who like statistics.

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