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**

The following grades were obtained on the final statistics in
summer 2003, in the urban studies department of Rutgers University.
there were 32 students in the class.
85,85,80,95,75,95,75,90
a) range of the observation
b) The interquartile range of the observation is
c)Interquartile creation of the observation is
d) variance of the observation is
e) standard deviation of the observation is
f) mean deviation of the observation is
g)coefficient of variation of the observation
h)coefficient of skewness of the observation is...

The grades obtained by students in a statistic course are
distributed according to a random variable X of normal
distribution:
X - N(68,100^2)
a-We choose a candidate randomly . What is the probability that
he has a score between 60 and 70?
b-The professor wants to give an A rating to 5% of students with
the highest marks? Determine the minimum grade necessary to obtain
A.

The following scores represent a sample of final examination
grades for a statistics course
23 60 98 32 57 74 52 70 82 69 74 63 80 62 80 77 81 95 41 65 92
85 85 61 36 79 55 76 52 10 64 75 78 25 80 48 83 64 88 82 81 67 41
71 67 54 34 72 74 43 60 78 84 89 76 84 17 90 15 79
a) Compute the 20th percentile of...

The following scores represent a sample of final examination
grades for a statistics course
23 60 98 32 57 74 52 70 82 69 74 63 80 62 80 77 81 95 41 65 92
85 85 61 36 79 55 76 52 10 64 75 78 25 80 48 83 64 88 82 81 67 41
71 67 54 34 72 74 43 60 78 84 89 76 84 17 90 15 79
a) Provide a frequency polygon with...

A study was conducted to investigate the course learning
outcomes in the math department. The table below lists the results
of such outcomes from randomly selected students in classes that
are held in different time.
Morning Class 85, 75, 70, 68, 72, 95, 100, 88
Afternoon Class 74, 77, 59, 68, 72, 85, 100, 63, 97
Evening Class 92, 86, 70, 85, 55, 77, 73, 82, 90
Weekend Class 80, 84, 75, 86, 80, 80, 90, 65, 77
Hybrid Class...

7. Philip wants to take a speed-reading course, but his wife
thinks that it is a waste of time. To convince her that the course
will really change the way that he reads, Philip decides to conduct
an informal study. He pols seven people, asking them to tell the
number of pages they were able to read in an hour before and then
after they took the course. The results he obtained are found in
the following table. Construct and...

7. Philip wants to take a speed-reading course, but his wife
thinks that it is a waste of time. To convince her that the course
will really change the way that he reads, Philip decides to conduct
an informal study. He pols seven people, asking them to tell the
number of pages they were able to read in an hour before and then
after they took the course. The results he obtained are found in
the following table. Construct and...

Suppose we have assigned grades for the 11 students in our data:
Grade A for students who scored≥ 90; B for students who scored≥ 80
and < 90; C for students who scored ≥ 70and < 80; D for
students who scored≥ 60and < 70; F for students who scored<
60.Following the above grade scheme, we observe that we have 8
students who received grade A, 1 student received grade B, 0
students received grade C, 1 student received grade...

1. Weights of statistics students were obtained by a teacher as
part of an experiment conducted for the class. The last digit of
those weights are listed below. Construct a frequency distribution
with 10 classes. Based on the distribution, do the weights appear
to be reported or actually measured? What can be said about the
accuracy of the results?
000000001233345555555555668899
Complete the frequency distribution below.
Last digit Frequency Last digit Frequency
0 ___ 5 ___
1 ___ 6 ___
2...

In what follows use any of the following tests/procedures:
Regression, confidence intervals, one-sided t-test, or
two-sided t-test. All the procedures should be done with
5% P-value or 95% confidence interval.
The empirical literature suggests that class absenteeism
undermines students’ academic performance and that an enforced
mandatory attendance policy may be beneficial.
Open Attendance data. Using data on 90 second-year students
enrolled in a Statistics course, test if students who are assiduous
in attending lectures have higher final grades than students...

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