Questions and Answers
Quantitative variables classify individuals in a sample according to?
Classify the colors of automobiles on a used car lot as qualitative data or quantitative data.
Qualitative data
Classify the number of seats in a movie theatre as qualitative data or quantitative data.
Quantitative data
Classify the temperatures of cups of coffee served at a restaurant as qualitative data or quantitative data.
Signup and view all the answers
Classify the native languages of students in an English class as qualitative data or quantitative data.
Signup and view all the answers
A summary measure that is computed from a sample to describe a characteristic of interest is called?
Signup and view all the answers
A numerical summary of the population is called?
Signup and view all the answers
Determine whether the summary is better described as a parameter or a statistic: The average GPA of Harvard's 2007 graduating class.
Signup and view all the answers
A survey of 1103 students was taken from a college with 14,500 students. Is this value a parameter or a statistic?
Signup and view all the answers
Determine whether the summary measure is better described as a parameter or a statistic: 89% of all UK students take out some kind of loan to attend college.
Signup and view all the answers
The average late fee for 561 credit card holders was found to be $56.75. Is this a parameter or a statistic?
Signup and view all the answers
A survey of 299 American households found that 15% of the households own a dog. Identify the population.
Signup and view all the answers
A survey of 299 American households found that 15% of the households own a dog. Identify the sample.
Signup and view all the answers
A survey of 299 American households found that 15% of the households own a dog. The 15% of the households own a dog is an example of?
Signup and view all the answers
A high school guidance counselor analyzed data from a sample of 600 community colleges taken throughout the United States. Identify the population of interest to the guidance counselor.
Signup and view all the answers
Kennedy's Book Store conducts a survey to determine what percent of all UK students plan on selling back their textbooks after the Fall 2014 Semester. Identify the population.
Signup and view all the answers
Kennedy's Book Store conducts a survey to determine what percent of all UK students plan on selling back their textbooks after the Fall 2014 Semester. Identify the sample.
Signup and view all the answers
Identify the population parameters: Kennedy's Book Store survey on UK students selling back textbooks.
Signup and view all the answers
Identify the sample statistic: Kennedy's Book Store survey on UK students selling back textbooks.
Signup and view all the answers
Random sampling enables the sample to be a good reflection of the population.
Signup and view all the answers
Based on 12,000 responses from 55,000 questionnaires sent to its alumni, a major university estimated that the annual salary of its alumni was $98,500 per year. This sample was collected using random sampling.
Signup and view all the answers
A large company would like to know what percentage of its employees would utilize an on-site daycare facility. Each employee is assigned a number from 1 to 5000, and a computer program randomly selects 100 numbers between 1 and 5000. This produces a random sample.
Signup and view all the answers
To estimate the percentage of defective items a machine is producing, a quality control analyst inspects the first 100 items produced in a day. This technique produces a random sample.
Signup and view all the answers
Study Notes
Types of Data
- Quantitative Variables measure numerical characteristics and can be used for calculations.
- Qualitative Data involves non-numerical categories, such as the colors of cars or native languages of students.
- Quantitative Data is exemplified by measurable attributes, like the number of seats in a theatre or temperatures of beverages.
Statistical Measures
- A Statistic is a summary measure from a sample that provides insight into a characteristic of interest.
- A Parameter is a numerical summary that describes a specific aspect of an entire population.
Identifying Parameters and Statistics
- Average GPAs, survey results, and specific percentages derived from samples can be characterized as statistics or parameters based on their scope (sample vs population).
- Examples:
- Average GPA of a graduating class (Parameter)
- Survey result from a sample of students (Statistic)
Population and Sample
- The Population is the complete set of individuals or items from which a sample is drawn (e.g., all American households).
- The Sample is a subset of the population selected for analysis (e.g., 299 American households surveyed).
Random Sampling and Validity
- Random Sampling enhances the representativeness of a sample regarding the population.
- Methods that rely on random number selection or computer programs contribute to a random sample.
- False Claims can arise from methods that do not ensure random selection, leading to potential biases.
Survey Contexts
- Surveys can yield insights about specific demographics (e.g., UK students selling textbooks).
- Parameters of interest identified through a targeted survey can guide broader understanding of population behaviors.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your understanding of quantitative and qualitative variables with this quiz. Explore how different types of data are classified, using examples from everyday situations. This is a great way to reinforce your knowledge of data classification.
