Question

An upper-level sociology class has 120 registered students: 34 seniors, 57 juniors, 22 sophomores and 7 freshmen. Imagine that you choose one random student from the classroom (perhaps by using a random number table).

What is the probability that the student will be a junior?

What is the probability that the student will be a freshmen?

If you are asked to select a proportionate stratified
sample of size 30 from the classroom, stratified by class level
(senior, junior, etc), how many students from each group will there
be in the sample?

Answer #1

in
a class of 35 students, 13 are seniors, 10 are juniors, 9 are
sophomores, and 3 are freshmen. If four students are selected at
random from this class, what is the probability that all three are
freshmen are selected?

Of students at a particular university:
20% are freshmen
22% are sophomores
23% are juniors
28% are seniors
7% are graduate students.
Additionally, 60% of students are female. You may assume that
being female is independent of the above classifications.
A student will be selected at random and the variable CODE is
defined based on the classification of the selected student:
If freshmen, CODE = 1
If sophomore, CODE = 2
If junior, CODE = 3
If senior, CODE =...

We have 18 students: 3 seniors, 5 juniors, 4 sophomores, and 6
freshmen in a class. We want to form a student organization to
represent the students. The student organization is composed of 8
students.
We want to select 8 random students (ignoring their class rank for
now). How many possible combination is there to form an
organization?
Incorrect.
Tries 1/2
Previous Tries
If we choose 8 students randomly, there is a problem because we
could have, for example, 3...

A football team consists of 13 each freshmen and sophomores, 14
juniors and 12 seniors. Four players are selected at random to
serve as captains. Find the probability that :
a) all four are seniors
b) There is one each: freshman, sophomore, junior and
senior.
c) There are 2 sopomores and 2 fresjhman
d) At least one of the students is a senior

In a stat class, there are 18 juniors and 10 seniors; 6 of the
seniors are females and, 12 of the juniors are males. a) Complete
the following contingency table for this scenario. If a student is
randomly chosen from this group: b) What is P(student is a junior)?
c) What is P(student is a male and a junior)? d) What is P(student
is a male or a senior)? e) What is the probability the student is a
male if...

An introductory psychology class has 30 male & 60 female
freshmen, 14 male & 14 female sophomores, 12 male & 13
female juniors, and 6 male & 6 female seniors. Suppose that 26
students are to be randomly selected without replacement. If the
first 10 students selected from the class were seniors, what is the
probability that the next student will be a senior?

A statistics professor classifies his students by their
grade point average (GPA) and their class rank. GPA is on a 0.0-4.0
scale, and class rank is defined as the under class (freshmen and
sophomores) and the upper class (juniors and seniors). One student
is selected at random.
Class
Under 2.0
2.0 - 3.0
Over 3.0
Under
0.10
0.25
0.20
Upper
0.05
0.30
0.10
What is the probability that the student is in the upper
class?
What is the probability that...

Administrators at A&M Texas university were interested in
estimating the percentage of students who are the first in their
family to go to college. For each scenario below, identify the type
of sample used by the university administrators. Possible answers
include simple random sample, systematic sample, stratified sample,
cluster sample, census, voluntary response sample, and convenience
sample. a) using a computer based list of registered students,
select one of the first 25 on the list by random and then contact...

You are asked to do a study of shelters for abused and battered
women to determine the
necessary capacity I your city to provide housing for most of
these women. After recording data
for a whole year, you find that the
mean number
of women in shelters each night is
250
, with a
standard deviation of 75
. Fortunately, the distribution of the number of women in the
shelters
each night is normal, so you can answer the following...

Professor Hardtack chose a sample of 7 students from his marketing class that has 35 students. The 7 students wore a red polo that day. What kind of sample is this?
A. Simple random sample.
B. Stratified sample.
C. Systematic sample.
D. Convenience sample.
Which of the following is quantitative data?
A. The gender.
B. The cell phone brand of your property.
C. Whether or not you have an American Express card.
D. The number of people who used the...

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