Types of statistical studies

What type of statistical studies was used in this situation?
A company wants to conduct a survey to measure employee job satisfaction among its 4,000 employees. The company assigns a number to each employee and randomly selects 300 employees using a random number generator.

• Simple Random Sampling

• Stratified Sampling

• Cluster Sampling

• Systematic Sampling

What type of statistical study was used in this situation?
A company wants to conduct a survey to measure employee job satisfaction among its 4,000 employees. The company randomly selects 5 office branches and surveys all employees in those branches instead of selecting individuals across all locations.

• Simple Random Sampling

• Stratified Sampling

• Cluster Sampling

• Systematic Sampling

What type of statistical study was used in this situation?
A school principal wants to survey 200 students from a school with 2,000 students about their study habits. She has done as follows:

1. 1. Calculate the sampling interval k = N/n = 2000/200 = 10
   2. Randomly select a starting point between 1 and 10. The chosen number is 5.
   3. Select every 10th student after the starting point until 200 students are selected.

• Simple Random Sampling

• Stratified Sampling

• Cluster Sampling

• Systematic Sampling

What type of statistical study was used in this situation?
The Ministry of Education wants to study how students from different backgrounds perform on a national math exam. To ensure fairness, they decide to select a sample of 10,000 students from the 500,000 students taking the exam. Since student performance may vary based on different factors, the Ministry categorizes students into groups based on Grade level: 10th, 11th, and 12th graders. The Ministry analyzes the full student population and finds the following distribution:

• Grade level: 10th (30%), 11th (35%), 12th (35%).

• To ensure a balanced sample, they allocate their 10,000 students proportionally based on these percentages.

• Simple Random Sampling

• Stratified Sampling

• Cluster Sampling

• Systematic Sampling

A coffee shop owner wants to estimate the popularity of a new seasonal drink. To gather data, they collect responses from 50 customers who visit the shop in the morning. After analyzing the responses, they find that 35 out of 50 customers say they like the drink. What type of sampling was used in this situation?

• Random Sampling

• Convenience Sampling

• Voluntary Response Sampling

• Judgemental Sampling

What type of study is this?
Duy Long wanted to study whether listening to music affects students' ability to concentrate while studying. He randomly selected 100 students and asked them what they usually do while studying. After that, he let some listen to music while let others not. Long then gave all students the same reading comprehension test and recorded their scores.

• Experiment

• Observational Study

• Survey

• Census

What type of study is this?
A study explored whether people who regularly drink coffee have better reaction times than those who do not. Fifty individuals who reported drinking at least two cups of coffee daily and fifty who reported never drinking coffee were asked to complete a new, unfamiliar reaction-time test on a computer. Their scores were measured and compared.

• Experiment

• Observational Study

• Survey

• Census

What type of study is this?
Duc Minh wanted to analyze students' study habits. He randomly selected 100 students and asked them whether they usually listen to music while studying or not. Based on their responses, he categorized them into two groups: students who typically listen to music and students who do not. He then gave all students a new assignment that they had never done before and recorded their performance.

• Experiment

• Observational Study

• Survey

• Census