Determine whether the following statement is about qualitative or quantitative data:
The baby weighs 20 pounds.
Determine whether the following statement is about qualitative or quantitative data:
My house number is 2381.
One hundred statistics students were selected from all statistics students in Virginia Beach. The 100 statistics students represent the:
The ages of all Ocean Lakes High School students are collected. These students would represent a
A musician wanted to see what people who bought his last album thought about the songs. Which choice best represents a sample?
A beverage company wanted to see if people in the United States liked their new logo. Which choice best represents a population?
At TCC, researchers who want to measure the college's effectiveness in achieving student learning outcomes decide to randomly select 10 classes and question all students in those 10 classes. This is an example of a
At TCC, students entering the student center are questioned to measure the college's effectiveness in achieving student learning outcomes. This is an example of a
At TCC, ten students from every degree/certificate program on campus are questioned to measure the college's effectiveness in achieving student learning outcomes. This is an example of a
Identify the sampling technique. A market researcher randomly selects 500 drivers under 35 years of age and 300 drivers over 35 years of age.
Identify the sampling technique. A lobbyist for a major airspace firm assigns a number to each legislator and then uses a computer to randomly generate ten numbers. The lobbyist contacts the legislators corresponding to these numbers.
Identify the sampling technique. To select a site for prom, surveys are handed out to students in the lunchroom.
Ms. Page, a dance teacher, wants to know if students would go to an after-school dance. According to simple random sampling principles, which of these is the best method to survey students about the dance?
Ways of generating random samples include:
Researchers used the telephone book to select people to be surveyed regarding city services. This is an example of
Wanting to survey alumni about their planned attendance at Homecoming, the planning committee sent out 5000 surveys to alumni. About 800 were returned. This is an example of
Students were surveyed about how they felt about their school. They were required to provide their student id number on the survey. This is an example of possible
Explain the relationship between a sample and a population.
What is the explanatory variable?
What is the response variable?
What are the experimental units?
What is a possible confounding variable?
A random sample of 200 patients is taken from a large medical clinic to determine if taking an omega-3 fish oil tablet daily lowers cholesterol levels. The patients are separated into groups by gender and then a blind study is administered, giving 1/2 of each group the fish oil and 1/2 of each group a placebo. The study found that those who took the fish oil tablet lowered their cholesterol levels more than those who had taken the placebo.
What is the exploratory variable?
What is the reponse variable?
What are the experimental units?
Juan conducted two different surveys about student transportation to school. For Survey A, he stood at the entrance of the school at 7:30 a.m. and surveyed the first 80 students. For Survey B, he used a random number generator to select 80 students in the school to survey.
Describe the sampling technique in survey A.
Describe the sampling technique in survey B.
Identify which survey Juan should have more confidence in and explain why.
Suppose a high school guidance counselor wants to find out the proportion of the students at his high school who have tried alcohol. He sends out an email to 200 randomly chosen students and asks them if they have tried alcohol. Of the 92 that responded, 6% said that they tried alcohol.
Describe how NONRESPONSE bias might lead to bias in this survey.
Describe how RESPONSE bias might lead to bias in this survey.
Is the sample proportion of 6% likely greater than or less than the actual proportion of the students at the school who have tired alcohol? Explain your answer.
What is a possible confounding variable?