What is the statistics processes stages and how do we select a simple random ?

imchasou
2022-09-26
Answered

What is the statistics processes stages and how do we select a simple random ?

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brodireo1

Answered 2022-09-27
Author has **12** answers

In statistical analysis, the sampling is defined as selection of subjects from the population so as to estimate the whole population. In other words, it is a technique of selecting suitable subjects so that they form a representative of the given population. Due to this process, the cost is lowered and moreover the data collection is quicker than accessing the whole population.

Stages in sampling process:

Define population of interest

Identify sampling frame, list of units to be measured

Identify the sampling method to select the units from sampling frame

Establish the sample size

Investigate the sampling plan

Collect the data

Also, a sample should be selected in such a way that it is a representative of the population. It is also important to know how the sample is selected. The sample selected to be a representative sample; the units in the sample should be randomly selected. There are various sampling methods to select the sample from the given population. Some of them are listed below:

Simple random sampling

Stratified sampling

Cluster sampling

Systematic sampling

Simple random sample:

The observations in the sample are selected randomly from population. That is, the probability for selecting one observation is proportional to the probability of remaining observations in the sample and moreover, each observation in the population has equal probability for including in the sample. Here, the samples are selected by wither with replacement or without replacement.

Simple random sample with replacement:

If the sample is selected by with replacement, then the observations occur more than once in the sample.

Simple without replacement:

If the sample is selected by without replacement, then the observations occur not more than once in the sample.

Stages in sampling process:

Define population of interest

Identify sampling frame, list of units to be measured

Identify the sampling method to select the units from sampling frame

Establish the sample size

Investigate the sampling plan

Collect the data

Also, a sample should be selected in such a way that it is a representative of the population. It is also important to know how the sample is selected. The sample selected to be a representative sample; the units in the sample should be randomly selected. There are various sampling methods to select the sample from the given population. Some of them are listed below:

Simple random sampling

Stratified sampling

Cluster sampling

Systematic sampling

Simple random sample:

The observations in the sample are selected randomly from population. That is, the probability for selecting one observation is proportional to the probability of remaining observations in the sample and moreover, each observation in the population has equal probability for including in the sample. Here, the samples are selected by wither with replacement or without replacement.

Simple random sample with replacement:

If the sample is selected by with replacement, then the observations occur more than once in the sample.

Simple without replacement:

If the sample is selected by without replacement, then the observations occur not more than once in the sample.

asked 2022-08-22

A city's telephone book lists 300,000 people. If the telephone book is the frame for a study, how large would the sample size be if systematic sampling were done on every 100th person?

asked 2022-09-22

A researcher is interested in the cumulative grade point average (CGPA) of students who enrolled in a Statistics course this semester. There are three groups, namely A, B and C which consist of 30 students for group A, 40 students for Group B and 30 students for group C. A sample of 50 students are randomly selected in this study.

i) State the population and sampling frame.

ii) State the variable of interest.

iii) Give the appropriate sampling technique to be used for this study.

iv) Calculate the number of students that should be selected from each group.

v) Suggest the data collection method for this study. Give ONE advantage and ONE disadvantage.

i) State the population and sampling frame.

ii) State the variable of interest.

iii) Give the appropriate sampling technique to be used for this study.

iv) Calculate the number of students that should be selected from each group.

v) Suggest the data collection method for this study. Give ONE advantage and ONE disadvantage.

asked 2022-07-22

A 129-kg astronaut (including space suit) acquires a speed of 2.90 m/s by pushing off with her legs from a 1900-kg space capsule. Use the reference frame in which the capsule is at rest before the push.

What is the velocity of the space capsule after the push in the reference frame? Express your answer to two significant figures and include the appropriate units. Enter positive value if the direction of the velocity is in the direction of the velocity of the astronaut and negative value if the direction of the velocity is in the direction opposite to the velocity of the astronaut.

What is the velocity of the space capsule after the push in the reference frame? Express your answer to two significant figures and include the appropriate units. Enter positive value if the direction of the velocity is in the direction of the velocity of the astronaut and negative value if the direction of the velocity is in the direction opposite to the velocity of the astronaut.

asked 2022-08-18

The Department of Health is conducting random drug testing in a barangay in relation to their age. You are the officer assigned to conduct the test in your own barangay. You only need 10 randomly selected students to be tested. You are to give instructions to the school director on how you are going to select the 10 students by applying your knowledge of the methods of sampling. To do the task well, you need to ensure that the sample is selected randomly. From a sample of 10, you take a sample size of 2.

TASKS:

A. Identify the appropriate method of sampling in the given situation and explain how you are going to do it.

B. Create a probability distribution that includes the list of your possible samples.

C. Compute for the mean, variance, and standard deviation of the sampling distribution of the means.

D. Construct a probability histogram of your sampling distribution.

TASKS:

A. Identify the appropriate method of sampling in the given situation and explain how you are going to do it.

B. Create a probability distribution that includes the list of your possible samples.

C. Compute for the mean, variance, and standard deviation of the sampling distribution of the means.

D. Construct a probability histogram of your sampling distribution.

asked 2022-08-20

A superintendent wants to survey teachers in his district to determine their opinions on the new school calendar. There are 14 different schools located in this school district. The superintendent randomly picks 4 of the 14 schools. At each of the 4 selected schools, they randomly pick 10 teachers to survey (for a total of 40 teachers). What kind of study design is this?

a.Cluster Sample

b.Block Sample

c.Multistage Sample

d.Stratified Sample

e.Simple Random Sample

a.Cluster Sample

b.Block Sample

c.Multistage Sample

d.Stratified Sample

e.Simple Random Sample

asked 2022-07-16

determine what type of sampling technique is used (Simple Random Sampling, Stratified Random Sampling, Systematic Sampling, Cluster Sampling, or Convenience Sampling).

A company is taking a survey of its employees and separates them into the following groups: Male/Part-Time, Male/Full-Time, Female/Part-Time, Female/Full- Time.

A company is taking a survey of its employees and separates them into the following groups: Male/Part-Time, Male/Full-Time, Female/Part-Time, Female/Full- Time.

asked 2022-10-16

A potted plant rests on a window frame above the ground. The potted plant is off the frame and falls from rest to the grass below 1.93 s later.

a) How fast is the pot traveling just before impact with the grass?

b) How far did the pot fall?

a) How fast is the pot traveling just before impact with the grass?

b) How far did the pot fall?