Question

Quota sampling:

Select one:

a. involves taking a stratified sample in which the number of sampling units drawn from each stratum is in proportion to the relative population size of that stratum

b. ensures that certain characteristics of a population sample will be represented to the exact extent that the researcher desires.

c. obtains units or people who are most conveniently available.

d. selects an initial starting point by a random process, and then selects every nth number on the list.

A disproportional stratified sample:

Select one:

a. obtains units or people who are most conveniently available

b. is a stratified sample in which the sample size for each stratum is allocated according to analytical considerations

c. involves taking a stratified sample in which the number of sampling units drawn from each stratum is in proportion to the relative population size of that stratum.

d. selects an initial starting point by a random process, and then selects every nth number on the list

3. Sampling can:

Select one:

a. all of the above.

b. reduce the labor requirements of an interview study.

c. reduce the costs of the study.

d. gather important information in a short period of time.

4.

To determine sample size, the unknown standard deviation of a population may be estimated by:

Select one:

a. a pilot study.

b. similar studies conducted in the past

c. the range of the data for the sample divided by six

d. any of the above.

Answer #1

1. Quota sampling: Option: b. ensures that certain characteristics of a population sample will be represented to the exact extent that the researcher desires.

2. A disproportional stratified sample: Option: b. is a stratified sample in which the sample size for each stratum is allocated according to analytical considerations

3. Sampling can: Option a. all of the above.

Since (Sampling reduces the labor requirements of an interview
study, the costs of the studyand gather important
information in a short period of time.)

4. To determine sample size, the unknown standard deviation of a
population may be estimated by:

Option: d. any of the above.

Since we can determine sample size using any one of three methods:

1. a pilot study; 2. similar studies conducted in the past; 3. the range of the data for the sample divided by six.

Five different sampling methods are described below.
Choose the one that defines stratified sampling.
1. Select members of a population by asking for volunteers, or
otherwise find a sample that is easy to obtain and is not based on
randomness or chance.
2. Order the population, select a random starting point and
interval, then select individuals every interval from the starting
point until the desired sample size is achieved.
3. Take a sample of size ?n from a population in...

Suppose we want to select a stratified random sample from a
population and we have $5000 for data collection. The population
has been divided into four strata, and we have decided to
allocation 20% of the total sample size into stratum 1, 15% of the
sample size into stratum 2, 35% of the sample size into stratum 3,
and 30% of the sample size into stratum 4. The cost of sampling per
unit is $6 for stratum 1, $4 for...

1a.) Stratified Random Sampling involves:
a. Dividing the population into overlapping groups
b. Taking a random sampling of a percentage of the pre-chosen
groups (usually 10% of total groups)
c. Choosing non-overlapping clusters (i.e. streets of a city)
and collecting data from all members of the selected cluster
d. None of the above
1b.) A data set consists of the values 2, 6, 3, and 1. If we
consider this a population (all the values available), the variance
is
a....

Identify the sampling strategy used in each scenario. Select
from simple random, systematic, stratified, cluster, convenience,
or state that this is not a random sampling strategy.
a. Names are written on ping-pong balls, then the balls are
mixed and drawn at random.
b. The population of those on campus are divided into students,
faculty, and staff. A proportional number are then randomly
selected using simple random sampling from each of the three
groups.
c. Individuals are lined up and every...

Identify which sampling technique was used to select the given
sample. Every 175th racquetball manufactured is selected to
measured its radius.
A)Random
B)Systematic
C)Stratified
D)Cluster

PART 1:
Sampling
How we select our sample will directly influence the
external validity of the study. If a sample is
representative, then our external validity
is stronger. If a sample is non-representative, then our external
validity is weaker.
QUESTIONS:
1.
You are interested in looking at the relationship between
student-to-teacher ratio and GPA at California 2- and 4-year
colleges. You suspect that average GPA is higher at 2-year colleges
where student-to-teacher ratio is low, relative to 4-year colleges
colleges...

____
Simple Random Sample
____
Cluster sample
____
Systematic sample
____
Stratified sample
1.
While this type of sampling is very eacy to carry out, and hence
saves time and money, it can very easily yield samples which are
non-representative of the population, unintentionally. Often, data
comes "in cycles", where the beginning and the end of each cycle is
"atypical". If the "kth" individual is picked at the beginning or
at the end of a cycle more often than a...

solve the following and mark the correct statement.
i)
In which case could the sampling distribution of sample means
be expected to be normally distributed?
A) The parent population is skewed, the sample size is
20.
B) The parent population is jumbled, the sample size is
20
C) The parent population is jumbled, the sample size is
50.
D) The parent population is uniform, the sample size is
20.
ii)
Recent English test scores were approximately normally
distributed with a...

A. Systematic Sample
B. Simple Random Sample
C. Convenience Sample
D. Multi-Stage Sample
E. Stratified Sample
F. Cluster Sample
1. Among your friends who took the exam, select 4 of them
completely at random.
2. Obtain an alphabetical list of
all students who took the exam. Starting with the 6th student on
the list, survey every 14th student.
3. Randomly choose 4 of the 14
sections, and survey every student from those 4 sections.
4. Choose a set of 42...

Select the correct definition of a sampling distribution of a
sample proportion.
a. a probability distribution of the count of a certain
characteristic of interest for all possible random samples of size
?ntaken from a population
b. a probability distribution of the sample proportions of a
certain characteristic of interest for all possible random samples
of size ?n taken from the population
c. a probability distribution of a population proportion of a
certain characteristic of interest for all possible random...

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