Determine whether the following statement is about qualitative or quantitative data:
The man weighs 195 lbs.
Determine whether the following statement is about qualitative or quantitative data:
My social security number is 123-45-6789.
Four hundred mice were collected in Virginia Beach. The 400 mice would represent a
The weights of all of the students at Virginia Tech were collected. These students would represent a
Mrs. Boyd want to find out how many of her students enjoyed Geometry in the past 5 years. Which choice best represents a sample that would give accurate data?
A record label wanted to see if people in New Hampshire liked their new logo. Which choice best represents a population?
To get an idea of student's plans after high school, 60 members of each of the 4 classes (freshmen, sophomores, juniors and seniors) were surveyed. This is an example of a
Students entering the parking lot are questioned to determine whether they enjoy driving to school. This is an example of a
The principal chose 1 class from each department in the school and surveyed every student in each class about their favorite season. This is an example of a
Identify the sampling technique. A study on attitudes about smoking in the US is conducted. A reseacher randomly selects 500 people under the age of 40 and 500 people over the age of 40 to conduct the sample.
Identify the sampling technique. An owner of an electronics store assigns a number to each former shopper and then uses a computer to randomly generate ten numbers. The owner contacts the shoppers that corresponding to these numbers to get their opinion on their shopping experience.
Identify the sampling technique. To determine the number of students who brought their lunch to school, a researcher stops every 4th student as they enter the building to check if they brought a lunch.
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:
In order to understand opinions on the Super Bowl halftime show, Noah opens a residential telephone book and calls 150 people. This is an example of
5000 emails were sent to former Ocean Lakes Students to determine their opinion on their school experience. 450 students responded to the survey. This is an example of
Students were surveyed about whether or not they drink alcohol on the weekend. They were required to provide their student id number on the survey. This is an example of possible
Describe a sample.
Describe a population.
Using the definitions of sample and population, describe how they relate to each other.
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 3200 students is taken from a large school district to determine if performing meditation will reduce anxiety. The students are separated into groups by gender and then the students are given a 30 minute lesson on meditation. Students were requried to track the number of hours per week that they performed meditation for 10 weeks. The study found that those who meditated more than 3 hours per week lowered their anxiety levels.
What is the exploratory variable?
What is the reponse variable?
What are the experimental units?
Dave conducted two different surveys about student engagment in school. For Survey A, he stood at the entrance of the library prior to lunch and surveyed the first 20 students. For Survey B, he used a random number generator to select 20 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.
A high school guidance counselor wants to know what percentage of students have tried marijuana (in any form). He sends out an email to 350 randomly chosen students and asks them if they have tried marijuana. Of the 123 that responded, 4% said that they tried marijuana.
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 4% likely greater than or less than the actual proportion of the students at the school who have tired marijuana? Explain your answer.
What is a possible confounding variable?