رد: استفسارات , اسئله , مساعده .. احصاء .. دوري 1
3. Which one of these events is not mutually exclusive?
A) Select a student in your university: The student is married, and the student is a
business major.
B) Select a ball from bag: It is a football, and it is a basket ball.
C) Roll a die: Get an even number, and get an odd number.
D) Select any course: It is an Arabic course, and it is a Statistics course.
9. If you know that 2 X = 20, X = 4 and n = 3, the sample standard deviation
will be
A) 6.67
B) 7.33
C) 2.71
D) 9.33
The standard deviation of the sample means will be ……………..the standard
deviation of the population.
A) equal to
B) larger than
C) smaller than
D) can not compare the two
12. A researcher wishes to represent the percentage of students in the department of statistics using a
pie graph. If the percentage of statistical department students is 25%, then their corresponding
degree of the angle on the pie graph is .........
A) 300
B) 1080
C) 900
D) 1800
The range of the data set -3, -7, -13, 0, -1 is .........
A) -13
B) 13
C) 2
D) 12
21. If a sample of data has mean 25 and variance 25, then its coefficient of variation is .........
A) 1%
B) 0.2%
C) 20%
D) 100%
28. Calculate the standard deviation for this sample:
2, 5, 3, 5, 4
A) 4.3
B) 18.8
C) 1.7
D) 1.3
41. A student scored 82 on an Arabic exam that had a mean of 88 and a standard deviation of 6; he
scored 58 on a Mathematics exam with a mean of 60 and a standard deviation of 5. Which of these
exam scores has a better position?
A) Mathematics exam is better
B) No difference between both exams
C) Arabic exam is better
D) None of the above
لو سمحتو ابا حل هذي االاسئله .. انا عندي نموذج الحل بس يعني ابا الشرح انو ايش السبب وكذا =)
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