Question

1a.) The following grades were obtained on the Research Methods course of students of the Urban Studies Department at Stanford University (70, 90, 85, 70, 85, 60, 95, 50, 65, 70). There were 95 students in the class. Variance of the data set is:

a.144

b.214

c.184

d.None of the above

1b.) The following grades were obtained on the Research Methods course of students of the Urban Studies Department at Stanford University (70, 90, 85, 70, 85, 60, 95, 50, 65, 70). There were 95 students in the class. Based on the data set, what percent of students received less than 85 for the exam?

a.80%

b.60%

c.50%

d.none of the above

1c.) What is Coefficient of Variation of the following population data set: 3, 2, 1, 1, 3

a.2.2

b.9.4%

c.44.7%

d.None of the above

1d.) Median of the students’ grades is 80 (for all students in the class). What does it mean (in terms of students’ grade)?

a.On average students received 80 in the class.

b.Half of students received 80 in the class

c.Most of students received 80 in the class

d.The best student received 80 in the class

e.Half of the students received less than 80 and the other half received more than 80 in the class

Answer 1

1 b.)

(70, 90, 85, 70, 85, 60, 95, 50, 65, 70)

n = 10

less than 85 => 6

(6/10)*100 = 60%

b.60%

1d.) Median of the students’ grades is 80 (for all students in the class). What does it mean (in terms of students’ grade)?

e.Half of the students received less than 80 and the other half received more than 80 in the class