Sampling
If you collect data on mode of student transport by asking 200 students you run into while walking to school, will you consider your data valid? Why or why not?
No. the sample is not representative since it has only students walking to school.
The rolling a dice and deciding which group a participant is placed is an example of what?.
This is an example of random assignment.
Which of the following statements is true?
In an experimental study, at least one variable is set by the researcher.
In an observational study, all the variables are set by the researcher.
In an experimental study, at least one variable is set by the researcher.
Give an example of primary data.
Here is an example
Primary data - conducting a survey asking residents of your town for their about their favorite sport
This number is not represented in Roman numerals.
Zero
a non-probability sampling method where units are selected for inclusion in the sample because they are the easiest for the researcher to access
Convenience sampling
Researchers studied the effect of eating nuts on cholesterol levels. 600 volunteers were divided into two groups. One group was required to consume a fixed quantity of nuts every day for five weeks. The other group ate no nuts during the same period
experimental studies.
Researchers studied the effect of eating chocolates on incidence of depression. 2,300 participants were asked to fill out questionnaires to determine if they were depressed. Volunteers were also asked to state the number of chocolate bars they ate each week.
observational studies.
Give an example of secondary data.
Here is an example
Secondary data - obtaining election statistics from state's government website.
-40 °C is equal to °F.
-40 °F.
Which of the following helps to obtain statistics that are more closer to the population parameters?
Increase her sample size.
Recalculate to get a closer answer.
Increase her sample size.
What is the advantage of experimental studies over observational studies?
It is easier to identify cause-effect relationships through experimental studies
A soccer is scoring poorly. Someone suggests that switching to a lighter soccer shoes or shooters. How should the soccer player test out this theory?
Try the shooters for an extended time and see if it helps.
Ask other players if switching to a lighter shoe worked for them.
Try the shooters for an extended time and see if it helps.
(also known as second-party data) refers to any dataset collected by any person other than the one using it.
Secondary data
Every odd number has this letter
letter "e"
All of the following produce bias ISSUES in voting except
1.Some people vote on any survey they find without giving thought to the issue.
2.Many people won't take the time to got to the website, so only those who feel very strongly in favor of one go and vote
3.Since people know that the IP address is being recorded they will vote for the candidate who they perceive to be the most likely to win
4.People read the article and determine which candidate most aligns with their beliefs and then go to the website and select that candidate.
4.People read the article and determine which candidate most aligns with their beliefs and then go to the website and select that candidate
A new manufacturer of athletic shoes wants to test consumer opinions of shoe design. There are 4 different styles, 5 different colors, and 3 different soles. Which is the best experimental design?
1.A completely randomized block design, blocked on style, with 15 treatment groups.
2.A completely randomized design with 60 treatment groups.
2.A completely randomized design with 60 treatment groups.
Suppose you want to see what people in your district think about school lunch. Which procedure would be a good way of conducting a survey?
1.Mail a questionnaire to randomly selected households in her district.
2.Send out an email to randomly selected households in her district.
1.Mail a questionnaire to randomly selected households in her district.
Data that has been generated by the researcher himself/herself, surveys, interviews, experiments, specially designed for understanding and solving the research problem at hand
Primary Data
The sum of numbers on the opposite side of dice
always equal seven
Which type of bias is present in the following question? "Do you agree that this method of SAT preparation is great way to improve scores?"
leading question
a form of sampling where a representative group of research participants is selected from a larger group by chance.
Random selection
research studies in which researchers collect information from participants or look at data that was already collected.
Observational studies
facts and statistics collected together for reference or analysis.
data
Islands High School is
Incredible