The dean of students mailed a survey to a total of 400 students. the sample included 100 students randomly selected from each of the freshman, sophomore, junior, and senior classes on campus last term. what sampling method was used?

The dean of students mailed a survey to a total of 400 students. The sample included 100 students randomly selected from each of the freshman, sophomore, junior, and senior classes on campus last term. What sampling method was used?

Solution: The sampling method used here is stratified sampling. Because the sample included the students from each of the freshman, sophomore, junior and senior classes.

Stratified sampling is is a probability sampling method and a form of random sampling in which the population is divided into two or more groups (strata) according to one or more common attributes and and a sample is selected by some design within each group.

The sampling method used by the dean to mail a survey is stratified sampling.

Further Explanation:

There are many types of sampling methods that are as follows,

(1). Simple random sampling: In this type of sampling the sample is chosen at random.

(2). Stratified sampling: In this type of sampling the sample is divided into the groups or strata.

(3). Systematic sampling: In this type of sampling the person is selected after every “nth” element at random from the sample.

Explanation:

The dean of students mailed a survey to a total of 400 students.

The sample included 100 students.

There are 4 groups in the sample freshman, sophomore, junior, and senior classes on campus last term.

The sample is divided into groups or strata. Therefore, the method is stratified sampling.

The sampling method used by the dean to mail a survey is stratified sampling.

Learn more:

1. Learn more about normal distribution

2. Learn more about standard normal distribution

3. Learn more about confidence interval of mean

Answer details:

Grade: College

Subject: Statistics

Chapter: Sampling methods

Keywords: Dean, students, mailed, survey, 400 students, sample, randomly, selected, freshman, sophomore, junior, senior classes, campus, last term, sampling method, stratified sampling, random sampling, snow ball sampling, availability sampling, cluster sampling.

answer: the two figures are congruent.

step-by-step explanation: they're congruent because figure efgh is reflected across the x and y axis but it was also rotated.

hope it !

option 2 is correct.

step-by-step explanation:

we are given two inequality equation

x+y> 5 and -3x+2y< -2

first we draw the graph of both function using t-table method

equation: x+y> 5

for x=0, y=5

for x=-5, y=0

table:

x   :   0     5

y   :   5     0

test point (0,0) , 0> 5

false

equation: -3x+2y< -2

for x=0, y=-1

for x=2, y=4

table:

x   :   0     2

y   : -1       4

test point (0,0) , 0< -2

true

now we draw the graph. see the attachment for graph.

common region would be solution set.

option 2 is correct.